Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45915f67182d84b…

MALICIOUS

PDF

86.3 KB Created: 2021-03-22 18:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dae6ce834016d8b6e374c7aa58eb4ac SHA-1: 9c1cd42cb5a4078f688bb8f4dd868309583caf9e SHA-256: b45915f67182d84b8a6675965341be944ff71e1f11ce896cd16875456967733c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicative of a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=how+to+curve+text+in+paintshop+pro+2019
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/95d953d.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/2724421.pdf
    • https://cdn.sqhk.co/lonubugogere/Fiihigc/lobalowivazun.pdf
    • https://cdn.sqhk.co/xojelumegasi/Pghsupi/popular_songs_of_the_60s_70s_and_80s.pdf
    • http://delojenopow.66ghz.com/jazupavajusanexevala.pdf
    • http://tufezoba.22web.org/3764166837.pdf
    • https://cdn.sqhk.co/feluxolid/cQgd0hb/nfl_fantasy_football_auction_draft_cheat_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/662432f3-95cc-42a5-9fb8-42620331b8a5/54691609483.pdf
    • https://uploads.strikinglycdn.com/files/23230a6b-60e9-4cc1-8aa0-39bad5888351/11300519430.pdf
    • https://uploads.strikinglycdn.com/files/b78b5a24-7ca1-4f1a-bf60-3f690c8b927d/how_do_you_charge_a_trolling_motor_battery.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_4237b6a776864e37977cd49834e96b2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52e35404-ea9b-494c-a6bb-95ac6ae3b999/refasoxuxava.pdf
    • http://wigezenefibi.epizy.com/world_famous_buildings_and_their_architects.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_e9d5259ef5544d4f90512f5771891738.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b582d363-e4a6-4a57-93e3-38af2bf59538/wixirawenabe.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_1727203912a7404ea83e8819d53eafd4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1bdf25ea-0961-4ad5-bcd5-397d86f1615c/hard_bible_trivia_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/5fb646fa-978d-4a71-93bc-92250950ffc4/ingles_sin_barreras_wiki.pdf
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_c04679d9bca64f5b9e6190c054c01351.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6a32194-8fe3-48ab-bd69-42123ee7e395/17220497930.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd90.bin
52c42726c87a8738283b17258c03fb804652a76b9ae149f0e9c9122476fe7ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 5652 bytes
font_01_sfnt_off000110df.bin
930675e0e42af6b15cd64006fb277901980f9065c803150e6c7297153afc661c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 10872 bytes
font_02_sfnt_off0001362b.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 16204 bytes

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