Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf32fcf1ffe66d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 19:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 37394151f48507eea9bfac394c0d91bb SHA-1: 94c760a5ada2e14ed050eafda65284b2301c17c7 SHA-256: d6bf32fcf1ffe66dd3134b5b50d1f26ccd9ff9b4b1f014dca58570017869df9d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many hosted on disposable domains, and one specific URL is presented as a search result for a seemingly innocuous topic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to redirect users, likely to a malicious site. No scripts were extracted, but the presence of external URIs and the overall structure point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=why+is+information+literacy+important+in+society PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469143/normal_6007cc96b9819.pdfIn PDF document text
    • http://doctorzlo.com/how_to_learn_keyboard_piano_keysfdulg.pdfIn PDF document text
    • http://apsdd54gfv.xyz/baseresuvagaju1duc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_6007b6ce1e346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_6024a0af3e054.pdfIn PDF document text
    • http://izzzaaa.space/how_to_insert_calendar_into_excel_spreadsheetarpb7.pdfIn PDF document text
    • http://povutigu.22web.org/baremuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d8329e28e.pdfIn PDF document text
    • http://unlockdeals.shop/8994414805zpaef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_601534dc2495b.pdfIn PDF document text
    • http://interior.estate/colors_in_spanish_worksheet_preschoolt2hrx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fd94ae3d8bbe.pdfIn PDF document text
    • http://superheatbelt.xyz/average_salary_masters_in_counseling_psychologya69oh.pdfIn PDF document text
    • http://blekrossi.ru/numerical_expressions_worksheet_6th_grade5pcz0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/62203387377.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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 5372 bytes
SHA-256: fa14fae1e8b2696ed0548f9d0db317c8d052418f8c23e95a6b0ca8667bb85edb
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10448 bytes
SHA-256: 85f31015ab741fa00d34c3336e0a2107ecaabfa534be40921999b75c187ed85c

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