Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcbcb9c80c29ad8…

MALICIOUS

PDF

70.5 KB Created: 2020-11-17 19:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6c7758fb2776abc3bfbcf44c79f088 SHA-1: d05318202ccf24b2edf0aaf79f23e0e9d2dccf79 SHA-256: 0fcbcb9c80c29ad89e7d4312e3bdc500f0bcd672d87bb20979495e67d2a83fdc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'traffset.ru', suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=ralph+p+grimaldi+discrete+and+combinatorial+mathematics+5th+edition+pdf+download
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5faed7440bfa2.pdf
    • https://tizosofamininu.weebly.com/uploads/1/3/4/3/134352685/depalanalisovix-nelewu.pdf
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/bawarobu.pdf
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f9383ae71586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/10812557-faf1-429f-9efc-e9fe6587e7a9/jamute.pdf
    • https://s3.amazonaws.com/remoxi/15815540067.pdf
    • https://uploads.strikinglycdn.com/files/e5794d25-0ef5-4e06-8c3a-cf86636c91d2/96811229818.pdf
    • https://s3.amazonaws.com/rimejiguvif/bajixatagiriwuf.pdf
    • https://uploads.strikinglycdn.com/files/c417bdea-0c72-4648-b999-e867d4111734/63931559343.pdf
    • https://uploads.strikinglycdn.com/files/79b1f799-4936-4a4f-a6ad-7bd678753af7/sopubupajemu.pdf
    • https://s3.amazonaws.com/zesotat/fitovojov.pdf
    • https://s3.amazonaws.com/zazelujeju/d_d_5e_guide_to_feats.pdf
    • https://s3.amazonaws.com/guxosa/22780240151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57f.bin
46c43b066f8f02e446230915f921e28745ed28634b9458229550d4af39b5eba2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57F 5720 bytes
font_01_sfnt_off0000d8e1.bin
6e2dd4c83583c011ea1cd730ce15365e859031e03d758a91e2089318b25c74e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 11212 bytes
font_02_sfnt_off0000fe7d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 4324 bytes