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File Signatures

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(@tony75)
Posts: 33
Eminent Member
Topic starter
 

Hi

Try to find flies like jpg, word and pdf manually via hexedit in FTK Imager

As we know the signature of jpg is:

Header --> FFD8FF and Footer-->FFD9FF

 

What’s is the signature of Word and pdf?

 

 
Posted : 07/07/2020 4:20 pm
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(@tony75)
Posts: 33
Eminent Member
Topic starter
 

As I see the header of docx is
header ---> 50 4B

But what is the footer?

 
Posted : 07/07/2020 4:41 pm
(@mscotgrove)
Posts: 938
Prominent Member
 

@tony75 A docx file is in fact a PKZIP file. Such a file can have any numeric ending.  The final bytes are a pointer to the final directory within the zip file.  It therefore depends on file size, and the number files in the ZIP.

With carving, one often continues until one finds the start of the next file

 

Don't forget, an a JPG there may be more than one FF D9 in a complete file

 

 
Posted : 07/07/2020 5:39 pm
Tony75 reacted
jaclaz
(@jaclaz)
Posts: 5133
Illustrious Member
 

Also, get TriD:

https://mark0.net/soft-trid-e.html

and/or study its deflist, either:

https://mark0.net/download/triddefs.zip

or its .xml version:

https://mark0.net/download/triddefs_xml.7z

 

The header of docx (as well as that of some types of zip) is:

https://file-extension.net/seeker/file_extension_docx

 

Header Hexdump:  50 4B 03 04 

jaclaz

 
Posted : 07/07/2020 6:02 pm
Tony75 reacted
(@tony75)
Posts: 33
Eminent Member
Topic starter
 

@mscotgrove

Thanks for information

 
Posted : 07/07/2020 6:57 pm
(@tony75)
Posts: 33
Eminent Member
Topic starter
 

@jaclaz

Thanks for links

 
Posted : 07/07/2020 6:58 pm
passcodeunlock
(@passcodeunlock)
Posts: 792
Prominent Member
 

Carving should be the last thing you should do. File writes to disk are not linear! If there is a way for recovering a docx at filesystem logical level using info from MFT/FAT entries, you should certainly try those first. It's more or less data recovery, not forensics 🙂

 
Posted : 13/07/2020 8:31 pm
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