Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b85c93407dbb00…

MALICIOUS

PDF

25.5 KB Created: 2020-04-20 16:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 44275f107087b64f26d9c217495a54e0 SHA-1: 0073650c4477dcb9467874e6d5c732e6576bfb46 SHA-256: 17b85c93407dbb0010a45e305cf27b9206aec39920281346980f7453ff0a6636
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to similarly structured URLs, suggesting a link farm or a mechanism for distributing malicious content. The document body, though partially corrupted, indicates it is presented as a worksheet, a common lure. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9179

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://gotykredit.com/uploads/1/3/1/4/131437254/131437254.html#all+types+of+sentences+worksheet
    • http://johnossionline.com/uploads/1/3/0/4/130489418/xasupatoxokixifepud.pdf
    • http://newfaithapostolic.org/uploads/1/3/0/6/130605135/7502d6.pdf
    • http://seven20shop.com/uploads/1/3/0/2/130274343/devadenarefo_fikix_dikudeduno.pdf
    • http://cartelivision.com/uploads/1/3/0/9/130969336/galirelexox.pdf
    • http://rondaaurand.com/uploads/1/3/0/6/130621645/1688254.pdf
    • http://conceptstudioonline.com/uploads/1/3/1/6/131636762/acd85009f682.pdf
    • http://merleandroan.com/uploads/1/3/0/4/130435670/9419626.pdf

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