Malicious PDF — malware analysis report

Static analysis result for SHA-256 0845f4ce3acf30a0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-17 17:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9691ff678cc97c61626a97dca68c529 SHA-1: 72f68e72db07cdc695d3d12c24d0ae5b00d511ba SHA-256: 0845f4ce3acf30a0900b3e4d3ba859709c1299794815bb720c5d04fe174092a9
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism to host further malicious content. The document body, though heavily obfuscated, appears to be related to search terms for downloading PDFs, indicating a lure to trick users into accessing malicious content.

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://kuzutuzo.ru/wix?keyword=scott+pilgrim+vs+the+world+pdf+download
    • http://nuguzofa.iblogger.org/68091510995.pdf
    • https://cdn.sqhk.co/ponibokilil/Ojhgj1v/40658267881.pdf
    • http://sarawavenudiwap.mygamesonline.org/zotowomijozamu.pdf
    • https://cdn.sqhk.co/faxixuwako/id1by4r/46751403947.pdf
    • https://cdn.sqhk.co/tavaxikanabu/jcH8lhd/resident_evil_movie_chris_and_leon.pdf
    • https://cdn.sqhk.co/kuxixixixi/Gbgdhhh/59237909444.pdf
    • http://fosireditoj.mygamesonline.org/how_to_power_pedals.pdf
    • https://cdn.sqhk.co/bufudoraxala/eajeSih/install_mods_gta_san_andreas_steam_version.pdf
    • http://tivepijezar.22web.org/tekakuvura.pdf
    • http://pobesegu.scienceontheweb.net/what_are_personality_assessment_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/nojovalukejiber.pdf
    • https://s3.amazonaws.com/waxegatulo/jivasezuzo.pdf
    • http://watosoxugulufi.epizy.com/tascam_424_mkii_manual.pdf
    • http://junumibovu.rf.gd/how_to_cut_calorie_diet_plan_a_3000.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_0e6b4006c0e9479f8a5d5afd149512a5.pdf?index=true
    • http://moretavumafoge.epizy.com/wozavo.pdf
    • https://uploads.strikinglycdn.com/files/7ad49c57-8469-40fe-806a-9308bad242d1/17085196469.pdf
    • https://s3.amazonaws.com/xidulumexi/gedivuresogu.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_5b2a9b5ab11046f0b72a078a62d441cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6811f968-4e4d-4f95-b897-ffed930ad434/66518222341.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_off0000e3d2.bin
683da656a810175fcf398736f380f4082628671a4d63a7319c4eb8bd53f14b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 5824 bytes
font_01_sfnt_off0000f794.bin
1a1255e880bfb94cb5643e470e2007ba4b007846d0cc83e0de5f47941aa3b27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 11788 bytes

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