Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d5e56e147c37d…

MALICIOUS

PDF

18.5 KB Created: 2019-11-09 23:16:59 +00:00 Authoring application: mPDF 5.7
MD5: 5f8c72c5cb7761d7809a5481c5d4fc28 SHA-1: 7ccbe31793661321b4c11712a9154d9f81fcfbfb SHA-256: 838d5e56e147c37dc47a3b07df21a60ad1ba56a5f539412260981141ad60d06a
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this document as malicious. While the specific intent of these links is unclear, the sheer volume and the heuristic firing suggest a malicious purpose, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cefasfese.4pu.com/4732739730738732/Jack-of-Spies-Jack-McColl-1-by-David-Downing.pdf
    • http://cefasfese.4pu.com/3739739737739732/Jack-of-Spies-by-David-Downing.pdf
    • http://cefasfese.4pu.com/1733735738736/Jack-on-the-Tracks-Four-Seasons-of-Fifth-Grade-Jack-Henry-4-by-Jack-Gantos.pdf
    • http://cefasfese.4pu.com/5730731736737735/Jack-of-Fables-Vol-7-The-New-Adventures-of-Jack-and-Jack-by-Bill-Willingham.pdf
    • http://cefasfese.4pu.com/3736732733733735/Jack-Jack-You-Don-t-Know-Jacks-by-Jack-Gilinsky.pdf
    • http://cefasfese.4pu.com/1731730735731732/Jack-of-Kinrowan-Jack-the-Giant-Killer-Drink-Down-the-Moon-by-Charles-de-Lint.pdf
    • http://cefasfese.4pu.com/1730733738739736738/Cold-Harbour-Dougal-Munro-and-Jack-Carter-2-by-Jack-Higgins.pdf
    • http://cefasfese.4pu.com/3733731734732730/Flight-of-Eagles-Dougal-Munro-and-Jack-Carter-3-by-Jack-Higgins.pdf
    • http://cefasfese.4pu.com/1731734738733731734/Nimble-Be-Jack-A-Jack-Nolan-Novel-The-Cap-s-Place-Series-2-by-Robert-Tarrant.pdf
    • http://cefasfese.4pu.com/3735738736737735/Hit-the-Road-Jack-5-Novellas-The-Hunt-for-Jack-Reacher-1-5-by-Diane-Capri.pdf
    • http://cefasfese.4pu.com/4735737735734/Jack-and-Rochelle-A-Holocaust-Story-of-Love-and-Resistance-by-Jack-Sutin.pdf
    • http://cefasfese.4pu.com/5738737736732733/Black-Jack-A-Jack-Sabre-Thriller-by-Terry-Wright.pdf
    • http://cefasfese.4pu.com/4736739736730738/Jack-The-True-Story-of-Jack-and-the-Beanstalk-by-Liesl-Shurtliff.pdf
    • http://cefasfese.4pu.com/8733731733736732/Jack-the-Jack-Pine-A-Mindful-Discovery-by-Jennifer-Brighton.pdf
    • http://cefasfese.4pu.com/1739731733730734/Spies-in-the-Sky-The-Secret-Battle-for-Aerial-Intelligence-During-World-War-II-by-Taylor-Downing.pdf
    • http://cefasfese.4pu.com/4730734737738736/Jack-of-Fables-Vol-2-Jack-of-Hearts-by-Bill-Willingham.pdf
    • http://cefasfese.4pu.com/2733730739735735/Making-Jack-Falcone-An-Undercover-FBI-Agent-Takes-Down-a-Mafia-Family-by-Joaquin-quot-Jack-quot-Garcia.pdf
    • http://cefasfese.4pu.com/2730734739731736/Trust-Me-Jack-s-Beanstalk-Stinks-The-Story-of-Jack-and-the-Beanstalk-as-Told-by-the-Giant-by-Eric-Braun.pdf
    • http://cefasfese.4pu.com/1730736737737732739/Jack-Imel-My-Years-with-Lawrence-Welk-as-a-Tap-Dancing-Marimba-Player-by-Jack-Imel.pdf
    • http://cefasfese.4pu.com/1730739730738734739/The-Tale-of-Jack-Frost-by-David-Melling.pdf

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