Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c0dcdb3c014f1b…

MALICIOUS

PDF

78.0 KB Created: 2021-04-30 12:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29da3ebaaaef245320da12b545e78eb1 SHA-1: ecd9fa3c5f6638b68088bc368d4b15598704637f SHA-256: f8c0dcdb3c014f1b7b96722838e594ace02df85cf208288d3bae57bbcf5d5247
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected the file as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent, likely to lure users to malicious sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/strik?utm_term=a+count+of+monte+cristo+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_601715a3deee8.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/jiijahj/boom_battle_bar_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/b4Ziiw9/84995385734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_601b7b35ced33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_603d171aaca0a.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/CFaijha/fuxizusobufuguzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6035809d9a23d.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/Dggih6G/19938741855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_5ffa7dbbc25de.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/mha1idQ/64041240666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komusera.rf.gd/zobifedun.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_db26d00c3be84e048a56875f477b74d4.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_253fa5d915114cc99ce4713bde88c0d7.pdf?index=trueIn PDF document text
    • https://3557a179-a1ee-4801-a209-85ad6f504536.filesusr.com/ugd/9c409a_9ef4eb8272af4d48af2a70977da9ce39.pdf?index=trueIn PDF document text
    • http://mugavividuroka.rf.gd/yatra_telugu_movie_box_office_collection_report.pdfIn PDF document text
    • http://sixosotonipo.epizy.com/18812587354.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_92a42e2e65334cf7ba03c83d05c08fde.pdf?index=trueIn 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_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 5084 bytes
SHA-256: 1249e75e7851642d2588f1063cb3ea469f1ec289ebe1a380312e6e739a5f11bf
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10256 bytes
SHA-256: 874bc30040adeb6f1cbec0e3f4c0f6e30d7e334060b96ba32e863f96a89f2071

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