Malicious PDF — malware analysis report

Static analysis result for SHA-256 7080d7c543c108b4…

MALICIOUS

PDF

77.0 KB Created: 2021-03-23 03:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4fae27420cd0bf7400507732733d4a SHA-1: e91ac70ee12e0b2b55f37c391f950b9d90ae47f4 SHA-256: 7080d7c543c108b4c6287aa8d5a2110e59d813d778b4f3c3177486c0290f85fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of an SEO link farm or a phishing campaign. The embedded URLs point to various documents, some of which are confirmed benign, but the primary URL is suspicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=american+sign+language+alphabet+chart+pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fda1e70152a8.pdf
    • https://cdn.sqhk.co/jebanufebejo/tnhdid4/mafia_city_review.pdf
    • https://cdn-cms.f-static.net/uploads/4401982/normal_604204a1209bb.pdf
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/tadobenegurizaxagod.pdf
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/razavov.pdf
    • https://cdn.sqhk.co/zogameva/5gihdia/dead_trigger_2_voucher_codes_2019.pdf
    • https://cdn.sqhk.co/surikuzezun/chjhhVi/24145830638.pdf
    • https://cdn.sqhk.co/sokavuwoz/hahgccn/73843400115.pdf
    • https://cdn.sqhk.co/fubafonu/ecKjfhj/best_tactical_shooter_games_xbox_one.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a39d9df8-18ef-4161-8730-5da91de9c6cb/61194520401.pdf
    • https://s3.amazonaws.com/bagisi/8th_grade_physical_science_worksheets.pdf
    • https://s3.amazonaws.com/jodabiladezot/ielts_liz_writing_answer_sheet.pdf
    • https://s3.amazonaws.com/sudevejerifu/is_india_a_good_investment.pdf
    • https://uploads.strikinglycdn.com/files/fb75e0eb-6785-4fea-96e0-8fd04058992f/rigabip.pdf
    • https://s3.amazonaws.com/wujodibu/43188543412.pdf
    • https://s3.amazonaws.com/fixararololu/zepexefokinid.pdf
    • https://uploads.strikinglycdn.com/files/5dfd96e9-fa47-4e80-8cc3-0b806afbb0ac/67226042960.pdf
    • https://uploads.strikinglycdn.com/files/ccdd3e2b-7731-4030-9afb-06121ff5e300/dozobozomegef.pdf
    • https://uploads.strikinglycdn.com/files/fa6b6cc7-4a96-4a41-b982-10e5132ea7df/vojib.pdf
    • https://s3.amazonaws.com/pokixovuxik/sunday_school_activity_sheets_for_toddlers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4c.bin
159f26b0d82591cf5c3fd0cb91e0f8621067c3c0716e4316daf2f3499e06c5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5700 bytes
font_01_sfnt_off00010076.bin
52072c2141864b15a4662470847befc156dc837cd78f14763cfa0937c71057fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 11176 bytes

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