Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf94a1fad5b8d3c…

MALICIOUS

PDF

85.1 KB Created: 2021-05-13 11:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a523ba886dbd3f9ab22b83749c033a9 SHA-1: 22e9b89060eedfac10387a8da8aa5951bbcc2c6d SHA-256: ecf94a1fad5b8d3c737c77cb64d6bff3b22d561c9b475f93f755a0aed7ce7b86
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=grade+2+aetherial+wheel PDF link annotation
    • http://pokanupat.iblogger.org/rejizoliruvotopigutom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_606b307f3da5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_60513e7f66166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6010fdde32854.pdfIn PDF document text
    • http://fiduvizowema.iblogger.org/interzone_1000_product_data_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_6010a331619a1.pdfIn PDF document text
    • http://vuliduku.22web.org/120_lessons_5_percenters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_600e4cac1f2f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5feb17e99c76b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_6050f2f1bd439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejetetivapane.epizy.com/what_three_major_rivers_of_europe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcbb3b5-62fe-4bba-92f1-060158d34b23/36658268205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58d7fc9-47b9-4b5b-bf37-9bc76b6f3993/wobinufedowudesowisek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7219e1-fd50-4323-b07f-2123781c47af/cyberpunk_2077_the_highwayman_code_not_working.pdfIn PDF document text
    • http://xusoromi.epizy.com/gta_vice_city_game_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c616ff3a-49d7-4858-b8d5-03819eb66ace/financial_statement_analysis_project_report_for_mba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64218183-de44-44ae-a10e-0e15abedfa77/are_acer_laptops_any_good_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/kisenirebovefumivefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9ced1b-8590-4c7d-a83c-bb91f77b152b/gone_with_the_wind_book_better_than_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c765519-a076-49b1-8b27-5b7370883399/32403434252.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/87198279068.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_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 4988 bytes
SHA-256: 40f783f6ad7fc71b44e3d2fddecb084a65579159e453bf5320cef3361255bdf5
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 11152 bytes
SHA-256: 4ab8d9e61d2cc4ad3f3fa1721445ca1e023add98b22bf3e14895703aa6fd5013