Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c1a4be9e0ed69…

MALICIOUS

PDF

131.1 KB Created: 2021-03-28 11:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 089d4c73a114cdd033f04fe907a6f7a6 SHA-1: 257174326a80f91b5da2ee7cc0078b9ec4df86e7 SHA-256: 1a0c1a4be9e0ed69a2cefc32d1b7742a7bb6f6221c59fcc3d82f51667d98e3e8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wix?keyword=how+to+make+a+button+door+roblox PDF link annotation
    • https://cdn.sqhk.co/tutabudoxuwa/jOmJ3je/xabevuvusowawiro.pdfIn PDF document text
    • http://copyright-rules-help.com/vogulav88t2.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/5fa091d06f07.pdfIn PDF document text
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/2586036.pdfIn PDF document text
    • http://fastcreditreport.info/what_is_a_storyboard_for_a_video2vp5c.pdfIn PDF document text
    • http://legiontry.online/84887494658mvwdu.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/6Rie2ia/microsoft_planner_tutorial_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/haCohiC/harley_quinn_boss_fight_arkham_city.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/pewakakako-zaraduz-xulofagedulute-botexujoterere.pdfIn PDF document text
    • http://healthyforczechrepublic.site/gitasazebipojo2ppwm.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/tadunoxoli.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/hfieicn/free_online_screen_recorder_no_time_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/i6diahe/street_racing_hd_apk_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_78f5cc7c8339449ea9925d5acb70ad78.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_1ecf2b5c692b46fc9adb11c25749d111.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_795979496289451683e534f4677eada9.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_fa9910d25408427799f1c28bd66c3e17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/bepapopejoxoxegifomozis.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/gosuvupigefo.pdfIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_81a0158f75c94138af511ae1cb8ed128.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_cade80aa81034586844a21edbed61204.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_ffeede02d5224173a27d01c70d066d1d.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_8cc3a2365bc54876a38f8f640d060ab4.pdf?index=trueIn PDF document text
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_8d5e80212af8480ca4d2295a8fada179.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/how_to_refill_original_epson_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/fraction_number_line_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/pedeje.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15845 29808 bytes
SHA-256: 455ea3be0a2d987ce3b6c462d77cb4a2faf022e4a7e2365a1aadc19ff4a82d6e
font_01_sfnt_off0001b431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B431 4952 bytes
SHA-256: 185f857d11332b771afffef4d5f807e466f1cb60464c11cef79c849850c2eaff
font_02_sfnt_off0001c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4F1 12216 bytes
SHA-256: a603fd610a79726aacedf82ed2d60ff4f086929ea8330f5078f3980fa143c555
font_03_sfnt_off0001ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED79 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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