Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa543937ce95532…

MALICIOUS

PDF

39.2 KB Authoring application: QPDF
MD5: f04c3c267e2321e808c4a4f433346ca1 SHA-1: 0bb01c70c9d3b7ddd493c22b23b7752132852f4f SHA-256: eaa543937ce95532315192cb63a1ba9a8bffb0a11050a913c7995aa98d3b4723
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs are the primary indicators of compromise, likely serving as lures for further malicious activity.

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://adam-butler.net/uploads/1/3/0/5/130589208/9384667.pdf
    • http://calciopreviews.com/uploads/1/3/0/2/130270745/sezopa.pdf
    • http://rightjoin.com/uploads/1/3/0/5/130544954/429515.pdf
    • http://nhtmedia.net/uploads/1/3/0/2/130272977/fozelitukim.pdf
    • http://colddiamnd.com/uploads/1/3/0/4/130483070/130483070.html#chapter+14+depreciation+solutions+class+11+2019

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000102a.bin
c61df190612f0b63d55c9e822fba6ddbaeec284e4f733c2ee6c17c0f289b9f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A 8844 bytes

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