Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0cfd7b9a6f7cce…

MALICIOUS

PDF

65.3 KB Created: 2021-02-22 06:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 931a5d514f91ec921ff54913f5c8e86b SHA-1: 4680049e542adfc3d18fc14cc1d511fe067576a7 SHA-256: 7b0cfd7b9a6f7cceb8ad628dcf5e6cb5d9027b5e033d6b1359a27ba1a99b9c91
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to host many PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to manipulate search results or distribute further content. No scripts were extracted from this sample.

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://leonvi.ru/123?utm_term=top+300+drugs+flashcards+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fe0d65d99fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jJ21jaE/exodus_movie_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/jggjfBI/38870746697.pdfIn PDF document text
    • http://ridatamararib.22web.org/54616754663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60186902e4c2d.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/ajhFihY/verisign_vip_access_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5feb82721d82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_5fdc0117c5886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_601878a718a3c.pdfIn PDF document text
    • http://lonuromaz.iblogger.org/weather_report_bopal_ahmedabad_gujarat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_600c40429e645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogasupi.rf.gd/xukapukoxixosagawi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/formation_adjoint_administratif_gatineau.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/mhw_charge_blade_guide_xbox.pdfIn PDF document text
    • http://gosefemifav.epizy.com/tawojudovubepifedexezik.pdfIn PDF document text
    • http://numekup.epizy.com/50278513500.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/15106598199.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_off0000c025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 5804 bytes
SHA-256: 5ecc166cdc70f69b83d8f816a06c69d6f2fd7a9d58522a80c0308f226ecd85a5
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 10124 bytes
SHA-256: ee8e11747e19ac8d45985e185d7c6c6ad85902885fea42ed254eed8999a418ae

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