Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a6e252969a3295…

MALICIOUS

PDF

69.1 KB Created: 2021-03-13 19:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dcb31093c4b60207e0b7d0b3fc814cfd SHA-1: 8edba4b8eb3d10bfa35a9fb4794b3f7b0de20851 SHA-256: 92a6e252969a3295fb48b6ffdde2242645539fcf7ac37140f21b20249786d7b3
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary external URI pointing to 'https://gimoguvi.ru/strik'. Heuristics indicate this PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=keurig+office+pro+premier PDF link annotation
    • http://kyukty68.xyz/what_are_examples_of_intrinsic_versus_extrinsic_motivations_for_reading_a_book43sr3.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/alien_vs_predator_extinction_pc_freev0wfh.pdfIn PDF document text
    • http://goodnatural.space/collective_nouns_worksheet_year_2luwmt.pdfIn PDF document text
    • http://zorexodepa.iblogger.org/how_to_introduce_myself_in_english_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/Uhajghi/jonosojonolemer.pdfIn PDF document text
    • http://6gusevshop.website/julusolusipovewukujifizalxdrxy.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/kiran_news_agency_alp_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/bDRihry/retro_racing_bucket_seats.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/fZgeiaS/40392792382.pdfIn PDF document text
    • http://4bochki.ru/harry_potter_e_camara_secreta_google_docs8irrt.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/diaxieB/90260948774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozuduxaxikagik.rf.gd/pepesamelukakuxekakuv.pdfIn PDF document text
    • http://xafuvarajuxeg.epizy.com/are_harbor_freight_batteries_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60907c61-2cbe-43fc-8b8a-17d6f8ef7ac7/brand_identity_design_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b980122b-1b2d-4350-90d4-f487b9c1d109/97068019447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff512674-61e4-4456-85ef-6e43b659e698/658406680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033139f4-287b-452d-bd1a-2b3cffb4c7d7/which_bts_member_is_the_kindest.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/english_speaking_notes_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedf913c-f5f7-442e-8160-228b15223c33/pogil_22_phylogenetic_trees_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374e5972-7cba-425e-81e2-ab7fbd28ea23/will_grayson_quotes_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7807a2-e5b6-4c95-b513-1d2ea64e5ded/12292421763.pdfIn PDF document text
    • http://jesaruge.epizy.com/civil_fe_exam_reference_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f366f6-e987-4de3-9eaf-c465168d077a/60114018024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27a44bc-233e-4187-ab7a-9ea2ec940685/wolipodukilafar.pdfIn PDF document text
    • http://gotewadale.epizy.com/how_to_light_pilot_light_on_gas_water_heater.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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 4884 bytes
SHA-256: db6a6af1aacefb786c3431375ad2d817e446223e748874c7e67c540b27c8afc8
font_01_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10612 bytes
SHA-256: 6679dee3b631510627b1ca09bed32a0a2c4a19c26ed16f0a6e7a7a5cfbc9751e