Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bb3c23fa1bb24a…

MALICIOUS

PDF

42.2 KB Created: 2020-04-12 22:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4055f1d79cb5b9147c161110d148257 SHA-1: 8887085af9718fe4fc67c5e468ec3390058edae5 SHA-256: b9bb3c23fa1bb24acadd67d835897f1476d8b0fae6b63642d942e55d5a8e4688
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to a history book and the wkhtmltopdf application, suggesting a lure. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to a link farm, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://florajamesphotography.com/uploads/1/3/0/6/130605440/130605440.html#libro+de+historia+quinto+grado+primaria+paco+el+chato
    • http://thealmostenoughwoman.com/uploads/1/3/0/7/130739082/manijotis-fazolu-zekitewuzagi-kuluwaposetakuz.pdf
    • http://rudafest.com/uploads/1/3/0/5/130546415/7958cee.pdf
    • http://christiekang.com/uploads/1/3/0/3/130312925/zoperodujitusiresobe.pdf
    • http://rethinkorganics.com/uploads/1/3/0/4/130489162/gemonizekik.pdf
    • http://youthcoalitionfl.org/uploads/1/3/0/7/130739250/polemonibamegakizo.pdf
    • http://crrc.website/uploads/1/3/0/2/130291783/segeridufowudo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b3.bin
325cec0640b25023ad645f4b0cea468226b00aad89be4004042cb66e7ed0226a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B3 10272 bytes
font_01_sfnt_off000085da.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85DA 16036 bytes

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