Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d7fd178f1a00b…

MALICIOUS

PDF

88.6 KB Created: 2020-11-13 13:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f01d8073af1908fcc234789198a12a6f SHA-1: 5bb755e92a05b74a99ffa8239891adcde411f350 SHA-256: 971d7fd178f1a00b5a3847c242b2917a25a5580ad6a2fbef38d5bf95aee1b965
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://traffking.ru/123?utm_term=skyrim+auto+load+order
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5fad31564cb18.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/resebubede-gafifetomo-sexosatasuvole-jijazusifa.pdf
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/mupuborutesurofepa.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fa2e5a4489cc.pdf
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5f8f45c20510d.pdf
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fa96f8274261.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a283001-b2c4-4b6c-ac9e-c27e39dfeb23/xusofivopafexatog.pdf
    • https://uploads.strikinglycdn.com/files/aedb1471-61fd-4808-bc0a-92e5b56dd5a3/kiwoketaruzedigedezupup.pdf
    • https://uploads.strikinglycdn.com/files/c25bb3d5-1936-44dd-9842-da38fec83c22/demeriwogijux.pdf
    • https://s3.amazonaws.com/jazofi/76874963317.pdf
    • https://uploads.strikinglycdn.com/files/1d503f25-8b10-4b1f-ad4d-1b61439298c5/29634587288.pdf
    • https://uploads.strikinglycdn.com/files/1a04982a-83e4-4b60-9722-f14b9b216936/belanezuzonomojanewarikuf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d4b.bin
41c487f6704aed7e2a0147ce513927ba467abcb01f20bcce41cc0b820b189a19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 5060 bytes
font_01_sfnt_off00012e72.bin
2cb0d84a6c3ae3c8d0ee37382028f874bbf8949b05dd6983bfe548937ae70b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 11512 bytes