Malicious PDF — malware analysis report

Static analysis result for SHA-256 548f5831c797bffd…

MALICIOUS

PDF

33.6 KB Created: 2020-04-10 21:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5e83401d5015169206b6f8e6e3ed365 SHA-1: 23b0f977332a2d10beef35c08c934b6b6e8a08fd SHA-256: 548f5831c797bffd600cdb2538c9f2e4cede16a0bf1245667bbf8713fce33307
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs supports this assessment. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sta-66-99-58-197.ladse.org/uploads/1/3/0/6/130620510/130620510.html#beowulf+%C3%B6l%C3%BCms%C3%BCz+sava%C5%9F%C3%A7%C4%B1+altyaz%C4%B1l%C4%B1+izle
    • http://anatomy-demystified.com/uploads/1/3/0/5/130540788/792521.pdf
    • http://blinddoghaven.net/uploads/1/3/0/6/130605509/gufezilo.pdf
    • http://5281digital.com/uploads/1/3/1/0/131071183/452836.pdf
    • http://migrod13.com/uploads/1/3/0/7/130740596/9094060.pdf
    • http://b2bcollectionstrategies.com/uploads/1/3/0/5/130588478/2bc8caec442efb4.pdf
    • http://learnenglish24.com/uploads/1/3/0/4/130483370/2903315.pdf
    • http://burnerbikes.com/uploads/1/3/0/2/130288864/bdf38f066.pdf
    • http://sidewalk.consulting/uploads/1/3/1/4/131438151/3212479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000570b.bin
f6f478048cbc802ee74645bd64dc91029e04f4154eb17a4b4aaa8ddb70f63735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570B 9356 bytes

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