Malicious PDF — malware analysis report

Static analysis result for SHA-256 92477cf6cd28c080…

MALICIOUS

PDF

81.3 KB Created: 2021-01-11 21:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0e027d973a7f54980dbc5033e40877aa SHA-1: ea982b79aa9a9e8cacbbc8ed7782c82cdfb5f1a6 SHA-256: 92477cf6cd28c080144591d0a4d2814a93e1b6fec5139b3c42768f98ce5a63ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It impersonates the brand 'Chase' and contains multiple links, including one that redirects to a phishing site hosted on weebly.com. The primary attack pattern involves luring users to a credential harvesting page via a malicious link embedded within the document.

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://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/2641861.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://trafffe.ru/123?utm_term=what+animal+lives+in+the+coniferous+forest PDF link annotation
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/2641861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5ff3722d17a0a.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/8f8f0f5caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f9f5869e47ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fc1dc31609c2.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/vawivufesuf_putaxoz_xabojakudup.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/tewikebezi-fulokutoj.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/bghShdd/dilefakadavibewodor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f8dccf8ac6a0.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/a3d71.pdfIn PDF document text
    • https://site-1173132.mozfiles.com/files/1173132/puwoxerunetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 5192 bytes
SHA-256: fa5afdc096b894d10330e4066618b941ad702ab2e675b76c4c5bc6ac95c78142
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10424 bytes
SHA-256: 1be46b82960228678320a32e299fd21633708c55da4f792d068da9f7d0dc1907

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