Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a226d27b8a18192…

MALICIOUS

PDF

27.9 KB Created: 2020-04-14 21:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 86aa472ed6fc3b7810efc632b1c3713a SHA-1: 196fe321f3cf040f789f03ebfb1765510976432f SHA-256: 0a226d27b8a181924382fbbf69255ec16226372c998cabe10a5a7338dda4067a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF 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 method to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.Dropper.Agent-9209494-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9209494-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tirsa.net/uploads/1/3/0/4/130483767/130483767.html#bootstrap+modal+form+submit+without+ajax
    • http://az2030project.org/uploads/1/3/1/4/131482975/zizigogofix.pdf
    • http://yeehawcookies.com/uploads/1/3/0/2/130289482/6013105.pdf
    • http://smartlyhomes.com/uploads/1/3/0/6/130620949/760601f.pdf
    • http://drvostill.com/uploads/1/3/1/3/131379833/2229369151.pdf
    • http://bellinghamgreekfestival.org/uploads/1/3/0/5/130543878/jokejinuzavawexo.pdf
    • http://snapdragonphotographymd.com/uploads/1/3/1/3/131379375/zonim.pdf
    • http://donaldsgoodfooddelivered.com/uploads/1/3/1/3/131379373/c286053.pdf
    • http://hostmaster.baerenfruehling.ch/uploads/1/3/0/4/130483989/cb75a0556d4b494.pdf
    • http://pncsportsconsulting.com/uploads/1/3/0/5/130589036/2994902.pdf
    • http://reannan.com/uploads/1/3/0/8/130813663/lonefubak.pdf
    • http://freshground.studio/uploads/1/3/0/8/130815095/zenevoxubadoje_xagajija.pdf
    • http://elements-accessories.com/uploads/1/3/0/6/130621156/gorolitofan.pdf
    • http://jgenterprisesolutionsllc.com/uploads/1/3/0/9/130969436/3209177.pdf
    • http://darlingrestaurant.com/uploads/1/3/1/6/131606457/1959144.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_off00004c4c.bin
5651b6c77f685925be6208781251dab81f1b503903bde3a84d9824ef8c968e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4C 5920 bytes

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