Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8592cb63ca29407…

MALICIOUS

PDF

71.8 KB Created: 2021-06-03 10:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51a234f98dea834bae7976c2be3cf5ff SHA-1: dda9dd77aeb418721d06f3f7929c59c2594fd1e8 SHA-256: b8592cb63ca294070c70698dd10c5b3a46fdb484040c6b277060847ba7473f81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=samuel+page+cassidy+boesch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488349/normal_6007019d845c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_60078b2c94a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493549/normal_6025c62a7b02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_6045bcf4e7024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_6032f09a84248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5ffa40b03a7d3.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/df7ce484-b47b-4ef1-a100-d8f76d41b12b/livro_so_cipriano_feitios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e68d31c-c888-482d-aeaf-2b91aacd95b3/68427011643.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/w/file/fetch/144547248/kejugixobosaluvisubid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cb38b7-b8e2-47b5-9c26-c7e6f0fe02cc/36184842384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d4a12e-df37-4632-9341-5c6710589042/forgotten_realms_novels_download.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144549918/is_hustlers_on_netflix_australia.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144539124/67866212982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677d2845-dccd-4aa1-89cc-d014c8a6969c/weferuzuwenofuneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8703122c-2ba7-4e18-8543-0e8f3c4a00dc/dedasewafutojaxitej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084ce7fd-84eb-446c-ae24-6cd67e36c676/the_sas_drivers_survival_handbook.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144421476/auto_insurance_quote_comparison_excel_template.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144445752/49856006021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a25f5d9-3188-473b-8d19-e74a337d4ba6/x_ray_control_panel_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03cb764-eb47-43d0-ad9c-1faeedd3ec6f/freckle_juice_book.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 5736 bytes
SHA-256: 591891e8ea2d50a13336a8d5abbeeaa6f4ef5ef635859e40f584ecdd106378c9
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 11956 bytes
SHA-256: 42cc40622769e88d60a702c0ee235916b8e470ece1b93d74d95e42e63b69aaf8

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