Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cfed7d9be732a8…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 03:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7dde3c5aabe17b8699354459c1b9fb5f SHA-1: 917fd01c5abb07a9bdab71b261eded2e6dcb044f SHA-256: d4cfed7d9be732a8c9591db0307a366876dc2fd641e77ca980801072ce2bf8dc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO poisoning attack. The document body, though partially corrupted, contains a title suggesting a lure related to biblical interpretation. The presence of multiple external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=que+significa+la+palabra+ciza%25C3%25B1a+en+la+biblia PDF link annotation
    • http://lagojoti.22web.org/problemas_alimenticios_en_adolescentes.pdfIn PDF document text
    • http://rekipeva.iblogger.org/6461993071.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/kjihbic/wojovavagedo.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/gayhurst_school_gerrards_cross_ofsted_report.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/dsjjhjb/formule_1_2020_game_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_9a69c7c7a4504af7ae435167271d973f.pdf?index=trueIn PDF document text
    • http://wukevuwotud.rf.gd/dafunapexufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4943a1-c6b1-47e0-bc84-13696fd80bfb/big_little_lies_season_2_episode_7_recap_vox.pdfIn PDF document text
    • http://zigakupebeb.epizy.com/haloalkanes_and_haloarenes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d4b317-983d-4d70-8ae8-dde63e4e19e1/pumofalorupovox.pdfIn PDF document text
    • http://berufepopokil.rf.gd/un_curso_de_milagros_alan_cohen_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1c2b7b-842d-4294-8e08-1fe09cf1ca49/six_sigma_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://mevuzulutifoxa.rf.gd/frame_relay.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_5268124b582d4828b48c27d2aaa5878e.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_483ff6d303b94875b042d287276ab474.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_2634279e1433489cb6ef869df08a66c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93cf863-dfd2-40a7-8cd6-0fdb1d87cf81/skyrim_xbox_one_x_load_order.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_eace12c4c8364a06b79e439335fbcdf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5966d766-3c89-41f8-be33-51d12438478f/how_long_to_cook_pork_on_slow_cooker.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_371616fe1f084d4d81bd4eb9718920d3.pdf?index=trueIn 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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 5644 bytes
SHA-256: a90cb9f99c5c80a45db5718278c1647b8c0d13e58f163f875d9754b33fbc0b26
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 12992 bytes
SHA-256: ed0a8b7a59465a21f026dd07bea8b98dfd88a096440fb7ce7b7f53481da057e7