Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d211cb263e2aff…

MALICIOUS

PDF

131.6 KB Authoring application: Smallpdf Desktop
MD5: de8f04dd81aed37bc3fba447014c935b SHA-1: e67db084e5870732cb4e8824339fcaadef5451a7 SHA-256: 81d211cb263e2aff196ae1e0c36c5a8af17a72a55aaeddc3d26dc4b5277091c0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including a critical alert for a 'PDF_SEO_LINK_FARM' and a ML classifier indicating maliciousness. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a phishing or malicious traffic generation intent. The document contains numerous embedded URLs, suggesting a tactic to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://ashlandeducationfund.org/uploads/1/3/0/5/130551310/ee9d464ce.pdf
    • http://wetawo.5525.su/uploads/2020/01/29/virufopigexofevugexu.pdf
    • http://catv47.com/uploads/1/3/0/5/130588173/bixagak.pdf
    • http://midcitycarriages.org/uploads/1/3/0/7/130775784/130775784.html#auto+mechanics+dictionary+pdf

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010fa.bin
94be44f818058c73882f468e5a9bc2687db96b9da26763fce054d6a184c38617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA 9304 bytes
font_01_sfnt_off00009680.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 2600 bytes
font_02_sfnt_off000135aa.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 16204 bytes

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