Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ca85dfd996bb7a…

MALICIOUS

PDF

28.1 KB Created: 2020-05-15 06:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b565dd36e4ffa8a339de723db402490 SHA-1: 5b3980ceca58d692bfc5e0f8b9b7b55d7265ded7 SHA-256: 37ca85dfd996bb7aedfb6138bf430e450786e3642b3e2c7f9310bf5a649a1308
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links to various domains, masquerading as CV templates. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting the primary purpose is to drive traffic to these sites. The ML classifier also flagged the PDF as malicious. No scripts were extracted from this sample, but the extensive link farm points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8699

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://litterregistrationpapers.com/uploads/1/3/0/7/130739452/130739452.html#cv+template+free++ms+word
    • http://topdaves.com/uploads/1/3/0/4/130478935/rinav_basofen.pdf
    • http://shopalexandraw.com/uploads/1/3/1/8/131856365/763098067b07b7.pdf
    • http://mollyandwolf.com/uploads/1/3/0/4/130435706/mudufutizuluzinu.pdf
    • http://patheticweasel.com/uploads/1/3/0/2/130273578/fipuvuzubutozodewe.pdf
    • http://thelmasgallery.com/uploads/1/3/1/8/131856672/govidokamebofiw.pdf
    • http://abbies.blog/uploads/1/3/0/4/130435929/af684b1635.pdf
    • http://crewbazaar.com/uploads/1/3/0/6/130605504/buvekigija.pdf

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