Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d1efa5a9e171f9…

MALICIOUS

PDF

63.3 KB Created: 2021-01-15 06:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: baa57819bafe03452d57cad7fa175aa3 SHA-1: 908953b13689819626f02dfab12bed5446a9bd1a SHA-256: 09d1efa5a9e171f9e80a579952aa4d306492192dd70dcdcb1b2a38bee28a8b0f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing (WhatsApp). It contains numerous external URIs, many pointing to disposable hosting and link farms, suggesting a phishing campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/cfb61ede7d0.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.
  • 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://trafficel.ru/123?utm_term=classical+conditioning+practice+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485935/normal_5fe6c9e0ba79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5fb3d9ac24052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f8efb4ec5329.pdfIn PDF document text
    • https://site-1175317.mozfiles.com/files/1175317/itopya_laptop_ram.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/cfb61ede7d0.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/pudide_gonojewo.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/whatsapp_video_status_download_hdvd9.pdfIn PDF document text
    • https://site-1175276.mozfiles.com/files/1175276/business_startup_funding.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/50266382913.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/pezetuzukij-fazeguki-zagakasuxive.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/luramamelolem/1259789426.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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 5396 bytes
SHA-256: 638b4b8e0479ab14c101fd7a6f9abda5b6214796b38e2dc3807045f8a6ec28ec
font_01_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 12360 bytes
SHA-256: 9d9ab50936b4a3ebb0fdef8a77767d42b46fbcd484d45f1d850b69cada449b44

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