Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7922d4f80f9178…

MALICIOUS

PDF

75.1 KB Created: 2021-03-11 12:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b8d7f2f6e0a77ed6b8aed08a4c12bdc SHA-1: 59325acd57c9598ca21ebfbcd008ef763d728f46 SHA-256: 2c7922d4f80f9178723d15fed270b6622bcd7f1f8dbd0ad0df592524c8a21c6a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users by redirecting them to potentially harmful content, likely as part of a phishing or malware distribution campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=beveiligde+pdf+bewerken+online
    • http://losasawavezu.iblogger.org/bostitch_6_gallon_air_compressor_manual.pdf
    • http://kinemulawaw.sportsontheweb.net/schwinn_sidewinder_21_speed.pdf
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/577ee8c2f6d9f2.pdf
    • https://nesotufofiwin.weebly.com/uploads/1/3/1/3/131381712/xaben.pdf
    • http://sefexetewizu.iblogger.org/australian_resuscitation_guidelines_drsabcd.pdf
    • http://bupiwasun.iblogger.org/travel_ukulele_plans.pdf
    • http://sozaxesugoj.mywebcommunity.org/bumixulugewekurowisosase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9323cb68-5884-44ab-adfc-659457ce6bbf/pixabisaxogujogojube.pdf
    • http://bebojivim.myartsonline.com/gibob.pdf
    • https://s3.amazonaws.com/zetituri/mugewowipibin.pdf
    • https://s3.amazonaws.com/tobaziw/dinokasipunagi.pdf
    • https://s3.amazonaws.com/nerugiraxura/list_of_connectors_for_writing_task_1.pdf
    • https://s3.amazonaws.com/sisaxu/hollywood_movie_site_dual_audio.pdf
    • https://s3.amazonaws.com/moduluzuxikari/zombie_shooter_games_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/2bf012f5-0f4b-4630-83ba-204b385e8d9f/nozow.pdf
    • https://s3.amazonaws.com/piradi/kindergarten_sight_words_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/52f89cd5-a494-4097-a0ff-ede8ed5dc1c6/c_programming_language_course_outline.pdf
    • http://panekad.rf.gd/asphalt_xtreme_android_gameplay.pdf
    • https://uploads.strikinglycdn.com/files/58506606-172d-4c98-b772-870afe720b72/pojesulelofe.pdf
    • https://s3.amazonaws.com/wujodibu/swan_lake_op._20_violin_sheet_music.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/90921154802.pdf
    • https://s3.amazonaws.com/jefazaxal/firex_i4618_beeping.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_off0000e8a6.bin
20613d922cae0b36edf10e1afc67cd28e365b28c0a84e40156ca2524935987ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 5228 bytes
font_01_sfnt_off0000fa95.bin
d160741d6a96ceddf5da515a95031dc61e350bdec9294e8bf74b0a0ef2345d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 10808 bytes

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