Malicious PDF — malware analysis report

Static analysis result for SHA-256 2139a129b2fdc3b6…

MALICIOUS

PDF

72.3 KB Created: 2021-05-05 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cb1341a4c2840a74da58cdaa3a352d2a SHA-1: 682a652fb8d1c7ee19b2c170bc8ef0dea7cbae3e SHA-256: 2139a129b2fdc3b665cb445f3029edd9f5e6da299f7b8fcb54c7a90307bd5e2c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+to+clean+braava+pads PDF link annotation
    • http://olx-delivery.cc/66512834151awtlq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5fe6d37763df0.pdfIn PDF document text
    • http://vadusulu.iblogger.org/81384915024.pdfIn PDF document text
    • http://ellmax-site.xyz/steven_curtis_chapman_cinderella_freeqw9cy.pdfIn PDF document text
    • http://copyrights-notices-helps.com/sotagaede2v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_6047ae546ec55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_6056854d61de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_6033f1ae41aae.pdfIn PDF document text
    • http://moneymaya.site/28183281673zjii.pdfIn PDF document text
    • http://sait-ok.ru/a_song_of_ice_and_fire_characters_neds_daughterv94hj.pdfIn PDF document text
    • http://idealica-columbia.site/sial_exhibitor_listr99jj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_6057194acb84c.pdfIn PDF document text
    • http://vwwv-avito.online/4287836069dg88z.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/37269373951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5fc738d313ad5.pdfIn PDF document text
    • http://limevekobo.iblogger.org/12th_marksheet_online_gujarat_board.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_605f2893f39c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_6046088292424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_60078f25bc2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_603778bf0a014.pdfIn PDF document text
    • http://new-leggins.site/gleichungen_mit_binomischen_formeln_aufgabenvup81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuzed/pippi_longstocking_movie_characters.pdfIn PDF document text
    • http://wadokeg.epizy.com/zunekewasigatisipona.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/yo_te_amo_tu_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/tecmate_optimate_4_dual_program_battery_charger_for_bmw_canbus.pdfIn PDF document text
    • http://tuwidapaj.epizy.com/96309309849.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/ziratevupaxuwusizikifer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 5320 bytes
SHA-256: f6c1e1aa1879f1b392104666caaad045b362ce7967459a639dda445499bb1813
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 11176 bytes
SHA-256: 3d56a4a4b49b57c92aee2d2ebe2589484cc6d9aa2cc842df8f2b7fd86fd17c19

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