Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bf20dc8ec04358…

MALICIOUS

PDF

74.0 KB Created: 2021-06-06 18:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0aebb4330adf25f3f7b463f372b8f474 SHA-1: 3ef549694c57e4efb7f9653402ad18e4d0e51384 SHA-256: c6bf20dc8ec043589ccdad7aacf65ca762cb780cc52990dffe8dd22ef75a31c1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://crewmak.ru/pbw?utm_term=how+to+install+a+sta+rite+pool+heater', is likely part of this scheme to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/pbw?utm_term=how+to+install+a+sta+rite+pool+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407102/normal_60294716c89a3.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/lagonovomof.pdfIn PDF document text
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/ddf12e9325f255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_6002b1a04b4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fea072cbefe6.pdfIn PDF document text
    • https://ketezujozak.weebly.com/uploads/1/3/4/7/134744557/8934392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_606aafcdb6bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_6033802d91d8d.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/wuwawutasuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_605a11966c7e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b8026e-e523-4c87-aea0-50defc9269e8/how_to_get_splat_hair_dye_out_of_carpet.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/w/file/fetch/144684822/votefepewutezekexawabu.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144466554/20000_most_common_english_words_scribd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9853eb2d-851f-445f-a8eb-69a0b1b7271d/kumon_math_answer_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd0f09b-ae35-4f21-8a16-88fb6260c441/monster_in_law_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39b4672-0d02-4e0d-9719-97dd260e55c2/interview_questions_and_answers_for_experienced_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e919c490-9e65-471f-965d-a5a2f3d59068/todilutosaragapujipime.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/w/file/fetch/144565983/xpress_m2020w.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144634032/benim_hocam_ayt_matematik_ders_notlar_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fb4b45-d708-4457-b5e4-c2f05c2a3eae/lirerifig.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/download_mini_militia_unlimited_healthjetgun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba5134f-9b93-41d5-82f2-f7fc3e9ca60c/how_to_learn_blues_guitar_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa75f17-4892-4001-833d-a0811adcc63c/atoms_elements_molecules_and_compounds_worksheet_answer_key.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 4960 bytes
SHA-256: 6416de3794fe04548e26f12cba3c307766b6d840b8e054cedb19af2a5a314159
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 12992 bytes
SHA-256: 74ec85b75e5bf3f156ad80230280bb0b140a0bf259cf8a3f42ca82fa53dcf756

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