Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5934f111d820e57…

MALICIOUS

PDF

24.9 KB Created: 2020-04-27 01:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d08efe71c11b2bed7e3363c5d5cb76b8 SHA-1: 017980ae5e0d0f830a69a2083380604b5556308a SHA-256: c5934f111d820e57dbfdc34b9ac4a4800bef370fca53d4ea3b3d688b67c9493e
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious with a high probability. The embedded content appears to be a lure related to IELTS exam answers, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9455

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://classiccarhirehamilton.com/uploads/1/3/0/3/130313643/130313643.html#cambridge+ielts+listening+10+test+1+answers
    • http://bobj4me.com/uploads/1/3/0/6/130603803/3340161.pdf
    • http://pacifichandpiecerepair.com/uploads/1/3/0/3/130313150/9718956.pdf
    • http://abilenecares.org/uploads/1/3/1/3/131379110/dumirodugukiv_mezevifavunava_voxitepew.pdf
    • http://yasminejordan.com/uploads/1/3/0/7/130739927/3eecfb24.pdf
    • http://borgproduction.fr/uploads/1/3/0/6/130621431/7220736.pdf
    • http://sgtreasure.com/uploads/1/3/0/6/130621840/tozexisoletam.pdf
    • http://okenergyfc.com/uploads/1/3/0/6/130639333/giramebodafe.pdf
    • http://customyetistore.com/uploads/1/3/0/2/130272524/pasetaxofoto.pdf

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