Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efa6fea8cb76df0…

MALICIOUS

PDF

73.8 KB Created: 2021-03-13 16:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3b144bfd7255fe7ab71d073177835c0e SHA-1: d5566e9e8305c05f2ceb81bdd717a359b3302841 SHA-256: 9efa6fea8cb76df0e458c4cbc8c455ba59d58b60809b4e64d9bddb10c004e4ec
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 0.9999

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://kuzutuzo.ru/aws?utm_term=lg+true+balance+washing+machine+error+code+cl PDF link annotation
    • https://cdn.sqhk.co/libibajuzumu/jjYNvhh/roku_remote_control.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/hge0sEM/96988584869.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/a15f221a-0af9-4b1a-b32a-feebce01c054/what_affects_the_speed_of_a_roller_coaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26ca13b-b382-4498-a87f-357ede003d08/xenusiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/94855132866.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_99b7875402ad48fca001d8dcd74c0f5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba3e9ea-ff5a-40f6-90dd-2e717bf1c68e/karuna_reiki_symbols_and_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a7a5ca-f53d-493c-b84d-c13b91595061/89084988190.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_a371096c2e924fcd88227a0d66da5108.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/block_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/cuanto_es_8_centimetros_en_milimetros.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_80667ffa69fc42e8b46dce26b0b557ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48351ef8-396b-4576-95c0-1e7b0879eaf7/mcdonalds_elearning_not_working.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_0dfe568c5ced4e34bd2cb56b120611ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d444abef-0e6a-4be8-a919-2e34c557cfd5/rules_of_attraction_simone_elkeles_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/how_do_relationships_among_organisms_help_energy_and_matter_flow_through_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef62a934-3fb8-45f7-bb18-2536584d6182/zivogepunawizag.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_f5b6c8374f6a49028a78e6fd36599caa.pdf?index=trueIn 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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 5524 bytes
SHA-256: 27b398e9976d36223e351ee341a7edbed7ece2e9c5d3c305d9fe88fa8dc7c6a0
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10676 bytes
SHA-256: 147eef7362bd740bc32b48c40b1e264bb0c8ed2f5056971268f77c23dd7be7ad

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