Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a3f979a868c98…

MALICIOUS

PDF

59.4 KB Created: 2020-04-30 20:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d090114f7568ac04d6167cb77349187 SHA-1: 706bc3e7d199c6e2673ece677a14fdf0a0de36ab SHA-256: 6c8a3f979a868c9891b1bcd0d028342a6941a1ee435ef2a8faef1bda5f515f36
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a heuristic specifically identifying it as a 'PDF SEO LINK FARM'. The document body, though heavily obfuscated, contains text related to 'Container terminal design guidelines' and references the wkhtmltopdf tool, suggesting a lure to disguise malicious intent. The presence of multiple unknown URLs indicates a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://vetraluminio.com/uploads/1/3/0/5/130551423/130551423.html#container+terminal+design+guidelines
    • http://goadcap.com/uploads/1/3/1/4/131438305/tepazamagixupufakuv.pdf
    • http://vceesolutions.com/uploads/1/3/0/7/130776819/be1fd7a42.pdf
    • http://northshoreassist.com/uploads/1/3/1/4/131438337/nobodifojogavaw.pdf
    • http://djtonyrocks.com/uploads/1/3/0/4/130435826/14113a.pdf
    • http://protectivehorsesolutions.com/uploads/1/3/0/2/130291699/51313d855fdb9.pdf
    • http://ellewalks.com/uploads/1/3/0/7/130740462/wavugu.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b803.bin
554075856f05f73bac04b8be1bba9c27e84ad45aa48b32ceb5615878c8b6b71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 8412 bytes
font_01_sfnt_off0000d86c.bin
915baeb1e29b1296448dc25187851e9706b77add1d29a836586dd6d4826066cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 2600 bytes

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