Malicious PDF — malware analysis report

Static analysis result for SHA-256 8240675621e12846…

MALICIOUS

PDF

40.0 KB Created: 2020-04-06 14:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 75048412d95fd07e297ce3ec275986f3 SHA-1: b258fb5eef25fa2fb529027f7a8b741de893a61e SHA-256: 8240675621e12846130caf609eb70e4e7345186ba4871991e99ed96355b5455f
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to other PDF files on various domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a tactic to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drakenn.net/uploads/1/3/0/5/130543369/130543369.html#louisiana+fall+vegetable+planting+guide
    • http://fscmadison.org/uploads/1/3/0/9/130969185/6b44e0c8dec.pdf
    • http://leosart.de/uploads/1/3/0/8/130873841/xisadesuz.pdf
    • http://ctsolit.org/uploads/1/3/0/5/130588942/1066599.pdf
    • http://movalhome.net/uploads/1/3/1/0/131070202/925cf0a8b4ed4f.pdf
    • http://masiautosales.com/uploads/1/3/0/2/130287285/a4b585532a.pdf
    • http://itmmechanicalservices.com/uploads/1/3/0/6/130621388/tatupoteratixetimu.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_off000075ec.bin
e60fdb930e112fd5f6d728a4759d54247d102069d8d982892ba9bf3966ed97fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EC 7568 bytes

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