Malicious PDF — malware analysis report

Static analysis result for SHA-256 902f997ba6620f1f…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 10:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d33a31366bdcf31af9a56455eee144b4 SHA-1: 93f91d8f43e4d2b43b62973ce758e2cf9b91c525 SHA-256: 902f997ba6620f1fa349511b4a2f5a1c158a38d4694e6f3cf1a198486673bf33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://bologen.ru/award?keyword=amadis+de+gaula+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/vasegodesazu/ejgfgdV/wolfen_timed_flow_basin_tap_cold_6.pdfIn PDF document text
    • http://oyuncuxx.com/samupogilejewovozamunzv65.pdfIn PDF document text
    • http://biweten.22web.org/94418166977.pdfIn PDF document text
    • http://giftcard-sale.store/how_to_replace_chain_on_homelite_electric_chainsawecrtg.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/hdWh1hb/positional_vertigo_exercises_with_pictures.pdfIn PDF document text
    • http://kzrovk.xyz/personal_development_planners_pptxrdgt.pdfIn PDF document text
    • https://cdn.sqhk.co/vibupiwoxaro/hhPWMib/vertigo_definition_mayo_clinic.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/degagaziv/77321824333.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/xaxojabevajuwabafi.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_7f19f3b132d644b5a35b8699cf96cda6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee23c4f8-209e-4965-9492-2fa1426f98b5/rinedewotokalada.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/towaresuvepedejorebuk.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_86a8ed982d024e34a33daf54c930892f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f44dd51-7cde-45d9-9253-0251db0bac73/juzebinalilipumad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9cdbf5-5c18-4201-9506-9ba79cf6b462/resesunesibosupejiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/how_much_does_it_cost_to_learn_graphic_design_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9cf2d3-05d4-4197-87ad-fa40586ce419/dir-655_default_ip_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c775805e-d736-4365-848b-4c457344e3ef/progressive_web_app_tutorial_for_beginners.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5464 bytes
SHA-256: bbeb7e87e3ca776e40142b0498833922503c1e84ee89288304b5022e8add5f69
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 12676 bytes
SHA-256: 1ad7c8c9bf71287c09fdec082944d5ce883e402cfe1ad3ead37c5d2cd0d64738

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