Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e9ce3a64c276d…

MALICIOUS

PDF

46.6 KB Authoring application: PDFBox
MD5: ad7a5325def936d29207773b9d80e84b SHA-1: e92340883ecef2ca69548ebaf7191abdd3f19c26 SHA-256: a22e9ce3a64c276da1877b55ff4188a1560cdd69d76f63d480d82800f4c3477e
152 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDF files, a common technique for SEO poisoning and distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mindmusclefitness.com/uploads/1/3/0/5/130588839/6366611.pdf
    • http://patchcreativeunit.org/uploads/1/3/0/2/130287919/fefa7.pdf
    • http://musclehamsterfitness.com/uploads/1/3/0/6/130639745/29dfa.pdf
    • http://nangreypottery.com/uploads/1/3/0/4/130436389/130436389.html#quickbooks+2016+for+dummies+pdf+free+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fb5.bin
293713b1472e07f973abedaaae92a512843a4826e9a2cbe7bf573fc640d2d028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5 7972 bytes

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