Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1398a1fecdcf126…

MALICIOUS

PDF

72.3 KB Created: 2021-03-06 21:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee4d5e00d2cd8f6ce5f90a79e800abb8 SHA-1: 9d3f55e8d8229a965e65acdb73ce9c27135b2f86 SHA-256: f1398a1fecdcf1267ec6c9f51d0a3d8928b5ce1ceb867c5386fa5419d52bd33e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=azar+grammar+workbook+answer+key PDF link annotation
    • http://rivozuzeno.mywebcommunity.org/22756877726.pdfIn PDF document text
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/9339449.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/turabim_fajadosezuwap_dikusoxelaz.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/58113689691.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/db0b18ccfb600.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/ifnifja/download_mutant_genetic_gladiator_mod_apk_latest.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/IhjcFgd/7905460151.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jPDjehc/jekusovudalaseropufuruna.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/what_is_brown_vs_board_of_education_1954.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/lenefomipoxizobafepadope.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/parapamada_kovusa_begiv.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://uploads.strikinglycdn.com/files/fccb2db5-1f11-4fd6-b146-aafececca773/mba_admission_interview_questions_and_answers.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_bc59cea0cf7b4408bbb300999d441621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca6e099-5728-4899-95bf-b4c229c5aea0/photoshop_cs5_crack_download_utorrent.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_a54744af98af44ae9536f35c83a784ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e90e4ec-8e90-48f8-b6b9-e2c950cb30ec/stihl_ms250_owners_manual.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_5a4b435add7e4854acf464e3c5823185.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb602bd7-3c56-483e-9846-27e01adc2d41/english_to_bengali_dictionary_download_for_pc_offline.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_547e540a6ca84a449fa62be2f3079254.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_5f795d40f3ea4b02899fcae8a8182be3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d294ae47-5c9a-4caa-ad8a-f167ffe822ad/coptic_bible_canon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 5072 bytes
SHA-256: 010cfeec43b0156a247396d912d0f7c7bd29519256b9080dbfc6a3f1b0805cd1
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10128 bytes
SHA-256: 751f04e3e911268ccdf0e337442b07a9a112a87c0025ea6e61bb3d0c4d058b86
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361