Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ca7e2842a32c4e…

MALICIOUS

PDF

47.2 KB Created: 2020-04-01 12:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e834829566077a37f5e87c776d9a6881 SHA-1: f8946b75ca5aeaa5b5c002a39acdd411b800bcd7 SHA-256: 05ca7e2842a32c4e2448242887a6ab2310eb4267accd68eb0cdf11c16fcbe8c2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files. This suggests a link farm or SEO manipulation tactic, potentially to distribute malicious content or improve search rankings for malicious sites. The ML classifier strongly indicated maliciousness, and the structure points towards a tactic of redirecting users to external resources. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://xocobean.com/uploads/1/3/0/6/130604696/130604696.html#itil+service+strategy+exam+questions+pdf
    • http://ouradcollective.com/uploads/1/3/0/7/130776489/4aea868.pdf
    • http://bluesrealty.com/uploads/1/3/0/6/130620492/tisegawobuxabej_mumuwabaxi_pimugo.pdf
    • http://wildbeastiesworkingdogs.com/uploads/1/3/0/6/130640198/3944311.pdf
    • http://addisonsentity.net/uploads/1/3/0/3/130313488/7d0ff6578ddc.pdf
    • http://fluxworldwide.com/uploads/1/3/1/4/131406804/tujejafokoxupij.pdf
    • http://sapphiremj.com/uploads/1/3/0/7/130776304/lerajiximosogif.pdf
    • http://onewayelectricalllc.com/uploads/1/3/0/4/130475909/gexadopunivejipuv.pdf
    • http://sharkdinghy.com/uploads/1/3/0/5/130551621/fukevowezedob.pdf
    • http://rileyfamilyfarm.org/uploads/1/3/0/8/130815026/xaroruzed.pdf
    • http://cigaretteaficionado.com/uploads/1/3/0/4/130491757/957fbc8d64.pdf
    • http://hostmaster.councilwomenworldleaders.org/uploads/1/3/0/7/130738591/1345692.pdf
    • http://millymop.co.uk/uploads/1/3/0/6/130620601/biwogifonak.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_off00008f7d.bin
10bead0d511e4911f2187d52199b869171cceaf91b74813b40140a987f15b082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7D 8376 bytes

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