Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b4c9cfccca6f4b…

MALICIOUS

PDF

34.2 KB Authoring application: OpenOffice.org
MD5: c0a9d1eae568f815065c7dc9d98446e1 SHA-1: ded42c3499c85da948357b20a6951a86b8bd8dac SHA-256: d4b4c9cfccca6f4b36c08334dad7404782a547dc0a37ba0e44dacf703c94fc82
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the 'PDF_SEO_LINK_FARM' heuristic strongly indicate a phishing or malware distribution campaign. The document body, while containing some readable text, is heavily corrupted and does not provide further clues beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mizzenmanagement.com/uploads/1/3/0/5/130542729/4a8c85.pdf
    • http://bleached.net/uploads/1/3/0/3/130312985/fepiwabixopojubabik.pdf
    • http://laurajentertainment.com/uploads/1/3/0/6/130639504/07a3ff421.pdf
    • http://fifthrowcenter.com/uploads/1/3/0/5/130590336/10727871bc94.pdf
    • http://ministermichealburton.com/uploads/1/3/0/6/130620616/vezutivuku-ziguwafubosigoj-luwufobarasek-kiwafib.pdf
    • https://jomolomiwoxilof.weebly.com/uploads/1/3/0/5/130588318/c451a3c2509a4.pdf
    • http://podollangpis.devsite-1.com/uploads/1/3/0/5/130589366/130589366.html#uji+non+parametrik+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010b5.bin
2edd87cf68f8b248b98651502a28c1673e585b11f1bc7e08175a348fce0611df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5 7220 bytes

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