Malicious PDF — malware analysis report

Static analysis result for SHA-256 665fce4552757060…

MALICIOUS

PDF

41.6 KB Authoring application: PDFBox
MD5: 30d351dea0db60f0ed3b55f19b090de2 SHA-1: c4d2a8505696315b15449c8c4e6eabf50f9cf61f SHA-256: 665fce4552757060768ab9d92d2c86aef9871f25b7eb2d4cc80f918c29d85d1a
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 and a high ML score. The document body contains numerous embedded URLs, many of which are structured similarly and point to external PDF files. This suggests a coordinated effort to distribute malicious content or phish users through a large number of redirect links.

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://motorcyclefriendlyhotel.com/uploads/1/3/0/7/130739522/9d5bc11dad.pdf
    • http://myonlinefashionmary.com/uploads/1/3/0/6/130620882/tomozu-rudesinawefuk-siwezemana-gotiref.pdf
    • http://diocesanconvention2018.org/uploads/1/3/0/6/130621317/dulafuzujiko_labemutetuti_lotuwowoka.pdf
    • http://aspoonfulsparkle.com/uploads/1/3/0/5/130543588/suwerazefagone.pdf
    • http://rak12library.org/uploads/1/3/0/6/130604716/c1077f623c9b2.pdf
    • http://ndchair.com/uploads/1/3/0/4/130483546/130483546.html#acanthosis+nigricans+and+type+1+diabetes
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010d7.bin
bf9efc03e76d9476bb891c3ec72c6eecfae6b64ef582fdb410ba4bea9f61fc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7 7644 bytes
font_01_sfnt_off000055a2.bin
0a19d3ec01c2bd5f2da2e654894ff9caac3df97291af1acb5ff150be3e6b34cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A2 18100 bytes

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