Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a36c28ae09998a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71d125bf2345673622814cb45421b4ee SHA-1: eaabc5887f7d0a5d524cb8e967f819dd6755cf06 SHA-256: c2a36c28ae09998a2fd125c53a759d77aaf86969ad868b0e0bee571a0855a0d3
244 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a brand-impersonation credential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dibusolig.weebly.com/uploads/1/3/4/0/134096246/6405768.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/award?keyword=event+registration+form+template+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fe20920ba0b9.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/yQhgnjd/70494899591.pdfIn PDF document text
    • https://dibusolig.weebly.com/uploads/1/3/4/0/134096246/6405768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_602a573cb356c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_605a41e1f0093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_6025ba8ae69fb.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/8571734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_604d21a558509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_600ba211c9419.pdfIn PDF document text
    • https://cdn.sqhk.co/bedepekemat/JrnXiju/jigutujugezevepape.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/b39c22c1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5ff5172dda240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_60467099e390f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fc5a7dfe5a1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/brother_mfc7860dw_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b941bd-061a-49f0-b326-2d162607d9ee/how_to_get_a_court_ordered_mental_evaluation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042f513a-b612-469c-8acc-1a76a11cf3c0/9831124496.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/zepadabenefan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ddc9cf-3339-4020-a757-3a707bdcca6b/jakozuwevajibudita.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/ssr_170cc_side_by_side.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/2400842079.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/ccleaner_full_keygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02a854c-f3ce-4487-9498-69dbe31565fd/aswc-1_honda_civic.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 5380 bytes
SHA-256: cf9c3a631808f1349af2e4cda81b394acf4712bdad859891c54a58d3e64db3c0
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 11084 bytes
SHA-256: 5b32eb6303a6c63a503fb5ce33095c970ea751332da7fe1f57d29181a3082c30