Malicious PDF — malware analysis report

Static analysis result for SHA-256 889f261a9e6bd488…

MALICIOUS

PDF

76.5 KB Created: 2021-04-06 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05e6e5de940c01f0e695113c38971c8b SHA-1: 289501a3603926aaa5fb5e6eec876a6596f6ad81 SHA-256: 889f261a9e6bd488f2202739615914e5e2775f9b19ee27c118281bf0763f5ac9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to zajinet.ru, suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of link farming on disposable hosting, often used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=capitulo+2+vocabulario+1+answers+spanish+2 PDF link annotation
    • https://cdn.sqhk.co/buvaboda/didcjhn/trucker_joe_diamonds_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fe047ea5e62c.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/jkYLgjl/kendo_ui_grid_dynamic_columns_template.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/bcbs_prior_authorization_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ffaad0f6f00f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fceadebeb8dc.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/heSkQij/ice_cube_breaker_gum.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/ef2jbPW/wooden_spoon_craft_projects.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/fiwobafuletuxugamumizipu.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd63361bbff7.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/wanuwat.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://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_c01bb0c3fca745aea23a3831dec873bb.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_2f41663883e74981948d8437d007d3b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a03884-f492-4c7d-81df-b03d89a8b010/2013_ap_bio_frq_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/lightroom_presets_link.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/87499788928.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/kangayam_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/zidivetigonali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c64719-bd8d-473f-9d09-bc35b745cfac/82870203036.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_7ab29167b7224ced9cc2f31dd2f3a706.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa01e658-64d6-408d-9756-08fbc2d798e3/87322317480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3827f402-9ea3-40e2-84e8-a650d80c6e50/xilegasokixeridufelovopux.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/69026145905.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_139034556ad049a48b64a3c0be783eb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/bukepoke.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_d4f017985cb04e9680c2286c93e1827f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4517236-3a0c-4347-847b-8d544ea3f93a/32061466056.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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 5400 bytes
SHA-256: 4a31b4353c16b4fe0249553e9b32645ac3272dbd3175be1bb27f60d623942d26
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 11100 bytes
SHA-256: 42e61a6da142b5ec1b8f3a70da24f9f1fe9c66e3677047f654abfb2e5e68eaab
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2