Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd56a346c873fe5…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 11:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01445d9fa661a03e6d9f2b22c871c26c SHA-1: 904f94462bf36fb6b190e291d861febd80eb2543 SHA-256: 3bd56a346c873fe57380ce84e9d8ca6a6fa4b4c50078b7d39b3616bfff87c46a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to 'https://crophysi.ru/wb?keyword=batman%20arkham%20origins%20steam_api.dll%20crack%20download', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'crack download', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=batman%20arkham%20origins%20steam_api.dll%20crack%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_601e2426a7430.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/jcLb7ib/how_to_not_join_the_thieves_guild_skyrim.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/djchgHb/obstacles_syd_matters_bass_tabs.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/hhjf5R0/jigovukagugalexukaw.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/KhhLKBy/61016758621.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/jdpzKjf/hat_trick_goalkeeper_training_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/OXibjhs/gagavefutamis.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/cgggigg/airtel_mobile_recharge_offers_tamilnadu.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/2Nigja7/monster_energy_supercross_game_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/authority_signatory_letter_format_for_gst.pdfIn PDF document text
    • http://misiwoferejisuj.rf.gd/64391484376.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/welajonafokojamanedabawib.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bambukat_full_movie_720p.pdfIn 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 5756 bytes
SHA-256: eba14f9d6fd4a15ceb6c08b773962b4f8d2191f1bdf4b3de8bbd7dd9095039be
font_01_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 11744 bytes
SHA-256: dae3eb029fb8b17d09b902ae366269ccad9f0741467ad7ff7026055bc45d6f1c

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