Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a1a17dad0ca616…

MALICIOUS

PDF

38.1 KB Authoring application: Scribus
MD5: dfa69c8b7f7f6611297f8db33f9c74c4 SHA-1: e4b0bbaff157c8c934283095c2cef8f60e219854 SHA-256: 43a1a17dad0ca6167b6fb0ac732a5b4e32e4b414ac11092d4f54071a8f6beb98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily corrupted, contains references to 'Grade 10 applied math worksheets' which may serve as a lure.

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://iloveacorns.com/uploads/1/3/0/3/130379431/73f77.pdf
    • http://xisavid.raz-ezzhaya.ru/uploads/2020/01/28/47bea3dea98b.pdf
    • http://behumble.fitness/uploads/1/3/0/5/130589415/zomafex_roninegago_muxetoda.pdf
    • http://allthesedays.org/uploads/1/3/0/5/130543256/2898900.pdf
    • http://jivijelipo.site111.ru/uploads/2020/01/29/nulipunajurola.pdf
    • https://foxujesijufi.weebly.com/uploads/1/3/0/2/130289799/3250c588e1.pdf
    • http://rentalspacificgrove.com/uploads/1/3/0/6/130621102/1ad2533b.pdf
    • http://kcbevco.com/uploads/1/3/0/6/130621706/130621706.html#grade+10+applied+math+worksheets

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000117c.bin
10475938957d47a6d2ab6671e8d02ddc39acfb9b652ea28787d292d8f525be35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C 8356 bytes
font_01_sfnt_off00004da1.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA1 16204 bytes

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