Malicious PDF — malware analysis report

Static analysis result for SHA-256 765fa08d8b6c52ff…

MALICIOUS

PDF

73.7 KB Created: 2021-03-06 04:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b26eaed189029c47b9859332f1ebfd70 SHA-1: 253d0b6c0dbda956d1bad57e44d1e2eca82e4a67 SHA-256: 765fa08d8b6c52ffb691fd16edc4456fab1d3ad80f9b1579f24cfd79ba41296d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The document's structure and numerous outbound links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=discovering+computers+and+microsoft+office+2016+answer+key PDF link annotation
    • https://cdn.sqhk.co/neviragar/haNUoSl/38256010922.pdfIn PDF document text
    • http://triple-doska5.club/bepakevudijavetiae0yi.pdfIn PDF document text
    • http://hayatevesigar.online/company_of_heroes_2_complete_collection_trainerx4ehu.pdfIn PDF document text
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/zalaxuzet_sasawekaxakan.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/cjeHGib/27744867106.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/gosezamuxuvaxezukakujef.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gfohd6t/home_workout_no_equipment_apk_cracked.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/zDpgjgj/flip_master_hack_apk.pdfIn PDF document text
    • http://bupetud.xyz/tefopapufe2fk62.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jdJghFS/printable_connect_the_dots_for_preschoolers_1-_20.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/7375699.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/hgjbLaC/animal_jam_unblocked_games.pdfIn PDF document text
    • http://coloradocustomelectric.com/il_principe_machiavelli_einaudirgdzn.pdfIn PDF document text
    • http://tekplafond.xyz/wigoretedugumunazebokopozs097t.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
    • http://taleweja.epizy.com/gatududosevolofedolexogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5be563a-c593-4c7e-872d-c2ae19c2062f/how_to_see_the_hidden_formula_in_excel.pdfIn PDF document text
    • http://vimeniwofeb.rf.gd/mikuni_carburetor_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cb77bd-9aed-4896-82aa-89c06df28107/best_non_programmable_thermostat_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b4dc26-f81f-4c1d-a79c-755ee0b28954/64557575521.pdfIn PDF document text
    • http://tipakofixu.epizy.com/john_deere_425_54_mower_deck_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8455e0df-83b5-4a03-b5b5-57f02681d308/epson_artisan_835_cannot_recognize_the_following_ink_cartridges.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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 6124 bytes
SHA-256: edf173b65ec8628e3fdd0d4e0bb0ab6f335102dfea9934f880f72069ff1751bf
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10320 bytes
SHA-256: 781c40bb63840a7282537045897dbe6f6e7b7a2d6dd910d56623524f3d1323a2
font_02_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3