Malicious PDF — malware analysis report

Static analysis result for SHA-256 8464e13f94eddf9c…

MALICIOUS

PDF

31.6 KB Created: 2020-05-17 08:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4d8abb6b62f29fb1cebbcb9333feb96f SHA-1: 7a8bde5c838905c0e4f5cf22bf29a7c97d9848da SHA-256: 8464e13f94eddf9cc4ee76f838bc3cba2b1f550cbfa239428b9be75047693687
96 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 as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • 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://picaresquepress.com/uploads/1/3/1/1/131164558/131164558.html#barium+enema+indication+pdf PDF link annotation
    • http://attiliosfarms.com/uploads/1/3/1/4/131438260/1098872.pdfIn PDF document text
    • http://plumbingsystems.org/uploads/1/3/0/4/130476204/bekufi.pdfIn PDF document text
    • http://arttherapytraining.org/uploads/1/3/0/2/130289686/079ba49.pdfIn PDF document text
    • http://citytourdeals.com/uploads/1/3/1/4/131438456/bexipavulabaw-velunegekezek-vibef-xepofaxo.pdfIn PDF document text
    • http://zoe4kids.com/uploads/1/3/0/3/130379423/xugele.pdfIn PDF document text
    • http://sandyguillot.com/uploads/1/3/0/9/130969200/7a845da46933a.pdfIn PDF document text
    • http://salesleadershipseries.com/uploads/1/3/1/8/131856146/974927.pdfIn PDF document text
    • http://heavensententerprises.com/uploads/1/3/0/6/130621490/dojidejilegaza.pdfIn PDF document text
    • http://balance360.net/uploads/1/3/0/8/130814009/pelimok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5357 9420 bytes
SHA-256: 28e76dd9719648b94bc99e2b25e693ac3cc6e5bb13ddf3a27b3223c69ee754bd

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