Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a965e7f4bd25f2…

MALICIOUS

PDF

33.3 KB Created: 2020-05-13 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35b3bb8f104149c661050cb666f5ce4e SHA-1: 8365771cf2e3c569ad2fc7274ec9048a926f323f SHA-256: 09a965e7f4bd25f2dd8fae36e9107d13f1535ed81707f19231a978c35e35841d
96 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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to manipulate search engine results or distribute payloads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the numerous external URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xciteeducation.com/uploads/1/3/0/5/130540554/130540554.html#sample+space+fundamental+counting+principle+worksheet
    • http://theabyssarts.com/uploads/1/3/0/2/130288514/bupowas.pdf
    • http://thephysicscouncil.com/uploads/1/3/0/6/130621480/6863291.pdf
    • http://safiajansmagazine.com/uploads/1/3/0/4/130479123/a8d699475.pdf
    • http://soliloquynotes.com/uploads/1/3/0/6/130603785/jixenivasenol.pdf
    • http://cavecreek-homesales.com/uploads/1/3/1/3/131380058/8901209.pdf
    • http://menagainstcancer.net/uploads/1/3/1/4/131437181/0a93d953.pdf
    • http://creativeofficesf.com/uploads/1/3/1/4/131406140/kigomosadawe_tokeles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005726.bin
43743809a591a2e09d8e5a11368e81a888a742af29acbc7c10652ecd23dafd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5726 10192 bytes

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