Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3b2b908ca48e56…

MALICIOUS

PDF

49.3 KB Created: 2020-05-26 22:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92dcc7fad4f876fd5989304a9c487c6b SHA-1: 99c6c8e7a49bee193b3021b348e0b91d80c725c0 SHA-256: 6c3b2b908ca48e569ef2ad735016773c15bfb4e96b10c53b626020e53154ce0d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://y0.undesirable.us/uploads/1/3/0/9/130969175/130969175.html#los+colegas+del+barrio+descargar
    • http://fwdperspective.com/uploads/1/3/1/4/131406710/tixudufufin.pdf
    • http://spiegelreflexionen.com/uploads/1/3/0/6/130639751/rowagoloteminoje.pdf
    • http://dropshipeducation.com/uploads/1/3/0/8/130814562/sujaponokipi.pdf
    • http://fysiopro.net/uploads/1/3/0/4/130483629/676c5b0667d.pdf
    • http://rockconcertexperience.com/uploads/1/3/0/9/130969316/286c6b5cb.pdf
    • http://animatorfun.com/uploads/1/3/1/6/131636772/walowefemivogij.pdf
    • http://suleaccessories.com/uploads/1/3/1/3/131398411/8839403.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_off00009386.bin
6c32e9eebad4d45bb3fc65ff861697eab75042a6d97ba720b5597b442d44eb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9386 11496 bytes

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