Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a6dd3217ed918…

MALICIOUS

PDF

66.3 KB Created: 2020-11-24 12:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31bee7a290e4e4571c85813672414b9 SHA-1: d0e02fc5d74237be0610fbddd762aff2845f5b80 SHA-256: 751a6dd3217ed918c2182c7cd7b389316a2e8a79ce2540612449a93eeefcd14d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'trafftec.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an 'Audi a7 brochure'. No scripts were extracted, but the presence of a link farm and the malicious verdict suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=audi+a7+brochure
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5fb6b08a513f6.pdf
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5fa5612f5a6e5.pdf
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/xuwefemuxamajasevera.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/2f2e24e5.pdf
    • https://cdn-cms.f-static.net/uploads/4403273/normal_5fb8a01391e19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6d835fb-fda2-44ad-ba27-197abd4cd743/pokuzugulexogematelure.pdf
    • https://s3.amazonaws.com/mukut/literary_one_pager.pdf
    • https://s3.amazonaws.com/lefemijip/manual_handling_risk_assessment_powerpoint_presentation.pdf
    • https://s3.amazonaws.com/xetasif/zadunede.pdf
    • https://s3.amazonaws.com/pazifetanegapu/kowekigejoletisulof.pdf
    • https://s3.amazonaws.com/zuxadol/71796870631.pdf
    • https://s3.amazonaws.com/tometubufimopim/83072236389.pdf
    • https://uploads.strikinglycdn.com/files/9a8f9240-3001-4fa6-883d-26bf07b0a0fb/izombie_season_3_episode_13.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_off0000c6c5.bin
a598c93efa761ebef6dc730762261e33e06217c0b1696167f0db5e8e36f70c28
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 5024 bytes
font_01_sfnt_off0000d7dc.bin
fe0d4eb6eefd988771ec37b53cb4fd1d2cf23e6f1c5b6952311ec53e5fb84501
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10580 bytes