Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a7531dc3c56eb9…

MALICIOUS

PDF

37.1 KB Authoring application: pdf-parser
MD5: 6739687d739a206cfdd2423a485e8a34 SHA-1: 358ed06c273a2ebead64143e02390480c4dc2022 SHA-256: 81a7531dc3c56eb9c1c28e36fa8bb0007fc44e9d78d6b8681c2510cb1d312503
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The critical PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links. These links likely serve as a lure to phishing or malware distribution sites, aligning with a spearphishing attachment attack pattern.

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://jasonseto.com/uploads/1/3/0/3/130312991/subuna.pdf
    • http://rachelnurmiart.com/uploads/1/3/0/6/130622073/mewibajusanejug_birawotik_zogexofubogari_nononidojur.pdf
    • http://t4gg.com/uploads/1/3/0/7/130739488/7d3ca.pdf
    • http://camellanorthluzon.com/uploads/1/3/0/6/130604987/vazaritalo-demij-besuvozarowoku.pdf
    • http://burnellinfinitymath.com/uploads/1/3/0/4/130483617/130483617.html#driver+wlan+acer+aspire+one+725

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a5.bin
f34d320eff58c16afa7c000b3d6ff72a0f546194daf310eb90fcc1508c7699cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5 8576 bytes

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