Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6fbc5887115a9d…

MALICIOUS

PDF

122.3 KB Created: 2021-03-24 15:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305bb78d5f673709a75e7c2bfa0d081b SHA-1: e7742df53d107b4e3b531e0fe964dcb5febde834 SHA-256: cb6fbc5887115a9d482a88ef1c64fb8fe6a8eb2227812bd28fd28bef27703b78
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing or to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with specific examples like 'http://vexasefagi.scienceontheweb.net/vizolamamuwugesa.pdf' being present. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the heuristics and the presence of multiple unknown URLs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=dvt+treatment+guidelines+pdf
    • http://vexasefagi.scienceontheweb.net/vizolamamuwugesa.pdf
    • http://kedepoba.sportsontheweb.net/baduzizujibubojokiluz.pdf
    • https://cdn.sqhk.co/rujiwujik/jgwifsT/nuvovapizorasikegix.pdf
    • https://cdn.sqhk.co/fagevibe/gftgiha/driving_zone_2_mod_game_download.pdf
    • https://cdn.sqhk.co/kipezipilojo/hfhdfif/ground_operations_job_description.pdf
    • http://vibolofisef.mywebcommunity.org/26539358682.pdf
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/3595556.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/bf5a37157.pdf
    • https://cdn.sqhk.co/kofuvufexo/Utig3gj/codes_for_alien_simulator_roblox_2020.pdf
    • https://cdn.sqhk.co/kojanakif/XjDjegd/meditation_for_beginners_free.pdf
    • http://xitodefigatefuj.medianewsonline.com/82235154215.pdf
    • https://cdn.sqhk.co/noxawuge/ihd5PVU/90741832591.pdf
    • https://cdn.sqhk.co/ragojagef/hVljdaQ/kijamalerunuga.pdf
    • https://cdn.sqhk.co/zefafulolit/fZxcyFk/18926721280.pdf
    • https://cdn.sqhk.co/vagofedewat/iciixRf/app_screen_recorder_iphone.pdf
    • http://piriveva.scienceontheweb.net/98520079384.pdf
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/kuwot.pdf
    • http://mowukedova.mypressonline.com/fejufadonajobudefaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a247a7b2-8a96-4d17-8e94-dfa989b868ac/2012_jeep_grand_cherokee_laredo_alternator_recall.pdf
    • http://foxukekamusun.onlinewebshop.net/characteristics_of_living_things_quiz.pdf
    • https://uploads.strikinglycdn.com/files/13067448-76af-41c8-88fb-84135294b70b/principles_of_communication_systems_simulation_with_wireless_applications.pdf
    • http://duxepivol.myartsonline.com/jowuwa.pdf
    • https://uploads.strikinglycdn.com/files/e588b52b-bc8d-40c7-8ebe-dde4ae891568/envision_math_textbook_grade_5.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_off0001a436.bin
df3d72c30bc6d44ef5757226f07b9988079e59cd501eb06e06e19d7af7c4a010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A436 5420 bytes
font_01_sfnt_off0001b69f.bin
c04b8263e30eb44fe1524666beffd7b804903fe3766c69da52d56d7385057ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B69F 10880 bytes

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