Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c2f48a9879bb86…

MALICIOUS

PDF

50.1 KB Authoring application: pdf-parser
MD5: 2ad0e33641984fd2d19dad1ee8a79986 SHA-1: d79d55977068dc2e22457d6a63a0ce63174f249d SHA-256: f1c2f48a9879bb864bc1c06b0055074861f038e04357e9c5e4d8ce18ed1b3aee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, with the primary one being http://physical-exam.com/uploads/1/3/0/4/130483959/baxotuvuvulizi-pdf. This suggests the document's purpose is to redirect users to a network of other PDF files, likely for SEO spam or phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://physical-exam.com/uploads/1/3/0/4/130483959/baxotuvuvulizi-refubizusawoji.pdf
    • http://msvetterochs.weebly.com/uploads/1/3/0/4/130488754/390773.pdf
    • http://alkuksa.com/uploads/1/3/0/3/130313274/72b950c05cb1.pdf
    • http://omeri.com/uploads/1/3/0/7/130739632/11adc1.pdf
    • http://browsmithmbc.com/uploads/1/3/0/6/130639365/1384172.pdf
    • http://keeora.com/uploads/1/3/0/4/130483393/kurob_rovifima.pdf
    • http://chinesebiblewiki.com/uploads/1/3/0/7/130739962/9492257.pdf
    • http://newencores.com/uploads/1/3/0/4/130483928/notogejejafona_zutirijisawuj.pdf
    • http://russianboutique.co.uk/uploads/1/3/0/4/130488833/tinikanunoputebisi.pdf
    • http://pameladirnberger.com/uploads/1/3/0/5/130551210/130551210.html#critical+discourse+analysis+vs+content+analysis

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001267.bin
2ec83ee971d57d64b66ee9eaab6e1ecd25437419873c02bda1afb040e0f6feed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1267 9216 bytes
font_01_sfnt_off000089cd.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 2600 bytes

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