Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39cd268739a4d2…

MALICIOUS

PDF

67.3 KB Created: 2021-03-23 06:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9baebfa45e82b4616d1f8d87f35653e0 SHA-1: ee929d0e58d4050b8b22f0b9fa22fab455766400 SHA-256: bc39cd268739a4d27b5bad4c2778177090fec280adc904fe34ac2b4ad5abeff4
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://jacksth.ru/award?keyword=avancemos+3+cuaderno+pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jacksth.ru/award?keyword=avancemos+3+cuaderno+pdf PDF link annotation
    • https://cdn.sqhk.co/xogovofofi/ghZS9c4/the_conquest_colonization_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/emQhcPu/ocotillo_wells_shooting_map.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/dieta_saludable_para_embarazadas.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/dotojevir.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/fH98LA2/36533059748.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87037839253.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/10400468023.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/agvUheo/amazon_echo_dot_with_clock_argos.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/xirewulotinosuxesopipudip.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/pewebopufupe/lion_air_flight_610_ntsb_report.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_b17c23bacc3546b6b26071600f681917.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/mercury_25_hp_4_stroke_service_manual.pdfIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_5d8305f6a89349fa808bb14eb86d561a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/36846913453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e855a50-a87f-466d-99ef-a057d8ce56ba/are_russian_volume_lashes_vegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd94274-3896-4a0a-963a-21ab7f4dd0ec/tisimaramezezologafegalil.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/jonelabok.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/jones_armadillo_lizard_care_guide.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_1d0a2d02759741b7b2590d232e303a82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d37123-ca05-4a94-8a98-840a16a95b18/8968818724.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/will_the_book_red_queen_become_a_movie.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_1e17188ab79640488086caf823bc495e.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/eragon_book_4_download.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/52575057224.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/bph_full_form_in_medical.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_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 5484 bytes
SHA-256: 2e69999029398de99daefcd10886fbbea5d076f7848fcf0df4abf6f01a4269fe
font_01_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 10660 bytes
SHA-256: 7832cd427660d8da8a3db417ea07f59dd7dfa7f4d007086f18c2ef5b45fd2f2a