Malicious PDF — malware analysis report

Static analysis result for SHA-256 121aee6b68f15317…

MALICIOUS

PDF

37.4 KB Authoring application: OpenOffice.org
MD5: 968886eea44b96cb39114b5f024b937e SHA-1: eec5548f816bac81d7c7c3ecdec997caf389083f SHA-256: 121aee6b68f1531791516818839ebacf2d26a97edb14eb1fe94f9dd73e623df4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.TtraffRobotInstall, and an ML classifier also flagged it with high confidence. The document body content appears to be corrupted or irrelevant, providing no direct clues to the intent beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://caltempmissionb.org/uploads/1/3/0/6/130640052/8960548.pdf
    • http://premierbv.com/uploads/1/3/0/6/130605443/fukibovevu.pdf
    • http://teamdelta.net/uploads/1/3/0/2/130270923/belilonawa.pdf
    • http://kavid.ca/uploads/1/3/0/6/130620585/gaviradujidexoxu.pdf
    • http://theelfbox.com/uploads/1/3/0/5/130589207/130589207.html#stardew+valley+summer

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000ff5.bin
9d410cbbb2b0ceced7f05e58eedc82695eabef6575eb3398790e1ffccff5bc32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5 8420 bytes

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