Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7466ccef4c8932…

MALICIOUS

PDF

77.1 KB Created: 2021-06-07 07:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b27e5e79d693cb3d58e9de0223acef21 SHA-1: 06686d836e766e4fbae89bd6c502a210f431850d SHA-256: af7466ccef4c8932a303b3eea8e85be6eb85e55a982b9c67c532c5f93b4e72c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://cructi.ru/pbw?utm_term=how+to+make+soy+wax+melts+at+home PDF link annotation
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/6f7dd92.pdfIn PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/4852504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd3cb14b21ce.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/05c1b3c34be11a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_605c87662812a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_604893ca2f14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60170ebd744c7.pdfIn PDF document text
    • https://kaxunuruji.weebly.com/uploads/1/3/4/7/134725802/24156b41ba418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60bd8c70f2b6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426972/dina_thanthi_news_paper_today_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739abd18-a0eb-486d-81c0-7869a104686f/pufes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073a4da9-4051-4b14-beac-909837039fa0/how_to_become_a_safety_engineer_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da91a285-7f15-4743-8bad-03d996765fac/heroes_of_olympus_movie_cast.pdfIn PDF document text
    • http://gijutexamuwa.pbworks.com/w/file/fetch/144675153/xejofimodumefa.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144702486/historia_grfica_de_la_medicina_manuel_barqun_caldern.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144416988/festival_internacional_de_musica_y_danza_de_granada_2019.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/m3_data_recovery_full_crack_kuyhaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32120046-839a-412f-8e30-5f90effdc0f6/star_wars_book_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f406ee-db7b-4fec-b61e-a72fea697a25/organizational_culture_and_leadership_4th_edition_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522fe3ab-c10b-4b17-98fc-85df7f931522/chemthink_molecular_shapes_worksheet_answers.pdfIn PDF document text
    • http://vasoxekisede.pbworks.com/f/robert_lafore_data_structures_and_algorithms_in_java_solutions.pdfIn PDF document text
    • http://fepazonavu.pbworks.com/f/droites_parallles_et_perpendiculaires_cm1.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144752055/ms_dhoni_the_untold_story_full_movie_1080p_bluray_download.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144608271/51565680777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5a6de9-315a-4e90-9d14-408aad7f7c87/bojagigowugifovato.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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 5116 bytes
SHA-256: e7c225d3f0c8284e1f6d12c3aac659d34ca51049cf6d013974162d3a2a11bdc1
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 11364 bytes
SHA-256: a9ceae4c45997034d6d422e6b105926f27e8040830f885b44f29f6f71c9d7b2a