Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f7af112d29e253…

MALICIOUS

PDF

41.0 KB Authoring application: GIMP
MD5: 8f6c8deb6052acc7bf6790c6bb85fbdb SHA-1: c4c1ab4a9337c83582be88b31a7e2c572a80f04d SHA-256: 17f7af112d29e25317c55bad77b1d27e60d1da646d3d7bcb3a4b8219b72ef3d3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also indicate maliciousness, specifically related to phishing. The embedded URLs are likely part of a link farm designed to redirect users to malicious content or facilitate SEO spam.

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://beautyflower.info/uploads/1/3/0/4/130476548/zitaga_vemezavif_volapanijip.pdf
    • http://cmqi.com/uploads/1/3/0/6/130603728/f88d163.pdf
    • http://nativologie.com/uploads/1/3/0/7/130775505/kikufejurafedufiv.pdf
    • http://tazisarup.strahovanie61.ru/uploads/2020/01/29/379493.pdf
    • http://kreativekidsworld.com/uploads/1/3/0/5/130590395/130590395.html#red+wallpaper+background+free
    • 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_off0000123b.bin
02e36b5a774b785a63f7a31e4930a2ba2a134bb93ba411ed94231619955b3dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B 8940 bytes
font_01_sfnt_off000059ba.bin
bb7f3a77f7833b39fe6b0cf08265a5ad0460cb4bda91382e6c877c0db3ce514d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BA 16164 bytes

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