Malicious PDF — malware analysis report

Static analysis result for SHA-256 2020ecae9275b934…

MALICIOUS

PDF

44.0 KB Created: 2020-04-12 21:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 323ce741d71013f3680fdba0a4958405 SHA-1: 283b3b8b74de9b8000a04571220b51cd06fa4e67 SHA-256: 2020ecae9275b93427979076376df566956c6ef8d5741fd7d9185ad2a3df4279
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, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body content was heavily obfuscated and truncated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://secure-pof.com/uploads/1/3/0/6/130604872/130604872.html#dosificacion+de+concreto+175+en+paladas
    • http://dreamgirlskloset.net/uploads/1/3/1/4/131437584/notejuroxasor-wesoxugik.pdf
    • http://fcsingers.org/uploads/1/3/1/0/131070434/2248bab4166.pdf
    • http://marbellarentals.agency/uploads/1/3/0/9/130969445/jogexifativ_mepoxonux_lidogiten_bulogowejeko.pdf
    • http://charunaukwal.com/uploads/1/3/1/3/131383838/luwibena_nemidezere_dimedefefapuv_bowufiwituwil.pdf
    • http://urbanmommyexpo.com/uploads/1/3/0/6/130620958/wolakuzekuv.pdf
    • http://subterraneancoffeeboutique.com/uploads/1/3/0/7/130775484/55edcbcad0.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_off000074f5.bin
abc6bd3a412d09611f18f8dac67359e7e23d8bf18b25b4e551ebe775333e9621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F5 9904 bytes
font_01_sfnt_off0000984d.bin
8ec8c2252d1b0a1cc16637c0e1f77da7137146423e231c53be47bbaf832064ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984D 2048 bytes

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