Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c3a3d93cbe8d77…

MALICIOUS

PDF

37.3 KB Authoring application: pstoedit
MD5: d4a163963d135646fda51e323d6c00f9 SHA-1: 39677e453d343261a71f999ad132bb8b1e98ce09 SHA-256: 87c3a3d93cbe8d77d918882264dd344ede35bf217c565f73a73f905af95d0674
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a link farm containing 16 external PDF links. The embedded URLs and the document body text confirm the presence of numerous links to external PDF files hosted on various domains. This suggests the document's primary purpose is to redirect users to these external resources, which could be used for phishing, malware distribution, or SEO spam.

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://cardigancommuter.com/uploads/1/3/0/6/130603835/peromor-mozuwumokeji.pdf
    • http://designer-parties.com/uploads/1/3/0/2/130289369/xafixumemapigojo.pdf
    • http://saeart.com/uploads/1/3/0/6/130620746/lolijavawuvowul.pdf
    • http://orrery.net/uploads/1/3/0/5/130551083/xejekibenopo-bodopi-ragupupa-gilesoxutalo.pdf
    • http://nationalpoolinspection.com/uploads/1/3/0/3/130313169/sefipuwo_fogarepigukeg.pdf
    • http://hoonc.org/uploads/1/3/0/5/130590583/zulujakalo.pdf
    • http://nfondy.net/uploads/1/3/0/5/130588586/8c8c53bb733d2f.pdf
    • http://theorlandorealtor.com/uploads/1/3/0/6/130620441/2819380.pdf
    • http://ne-surgerycenter.net/uploads/1/3/0/5/130540040/130540040.html#dexter+meme+accent+template

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001372.bin
5d50f6f88027f5ee078bf706df143a7c940daed5a24293e317afe48c11da58dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372 8692 bytes

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