Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7fd7b10b42c6a9…

MALICIOUS

PDF

69.0 KB Created: 2021-03-26 11:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f6f5e40b39eda7a7c7b2a746c88a9f32 SHA-1: 3f0ba5cc80c4eef600f42ca7e718df98e8568a15 SHA-256: da7fd7b10b42c6a9115518419699d4768a756975636ab519c68f51942e406b62
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to use the document for SEO manipulation or to host phishing links. The primary malicious URL identified is https://bologen.ru/wix?keyword=etek+2+star+frame+manual, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=etek+2+star+frame+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502188/normal_60488d3402e94.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/biY4USS/71983870877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5fd669ad0a98b.pdfIn PDF document text
    • http://tazizaj.iblogger.org/how_to_set_radio_station_on_pioneer.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/heAD0ij/air_hockey_speed_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6039cbcb8ed50.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/fekilaxebusimibejagepapi.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/oigFigG/urban_arrow_warranty.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcd843275309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60122cda3c7cd.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/alchornea_laxiflora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5fc6040e4bf26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a39834-9c9c-4ae4-9bf1-ed088516dd28/unreal_engine_4_fps_tutorial_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314f00e1-2cde-4c10-956d-4b1bef0513ec/tom_sawyer_movie_1973_tagline.pdfIn PDF document text
    • http://kipenul.epizy.com/91973659416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76d6c5c-1264-4bc3-a432-9523204b2edf/10741977259.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_c05e1752adaf4b64aac0cb66a9e8b6d2.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_5b22835864f543e8ad507bb377d3a515.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0c6d8-ef79-46fc-acfe-4111f2267b13/63586283310.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_4e06167e68f54ca1be0bb7afd9e3976e.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_f3c4c9a764f24616836c5d7e61c6996a.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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 5068 bytes
SHA-256: d6857d9585d77205a7642b879f0123e4e5bb95f9b312285890babe4a63b5fa53
font_01_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10840 bytes
SHA-256: 886d8dc56030dab150344f195a58484054fc78e66358c43e59327b7aae9dbec4

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