Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4775758cb87632…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 09:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 295a92e474f50a7dfac132af302a18d2 SHA-1: 533164c221a5689dd0a3e8d058de3d777a0d4422 SHA-256: be4775758cb876328bca772968cbc73246ea0e9e5fc262a7f57b8808891138c0
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to search queries, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=slender+man+game+unblocked+hacked PDF link annotation
    • http://greenbike.shop/kenzie_burke_21_day_reset_free_downloady2d5v.pdfIn PDF document text
    • http://bio-ita.fun/xexixc8o6i.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/3713249.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://ukranews.site/gram_staining_download2tti4.pdfIn PDF document text
    • http://you-bestshop.xyz/sewepajhb5f.pdfIn PDF document text
    • http://gobigs.space/xuxezujudulepodotoletfafo2.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/tepowivixibuxupoteko.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/16239460c4d.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/hayward_ecostar_drive_controllere4r1s.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/4f9c1a39-55a0-4798-9dc5-38c1f4bc5375/maytag_4000_series_washer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba43ee2-c60b-4070-8f7e-ec89c96f2539/38019824224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a3a28-221e-485a-8551-b62ae4a17a8e/pavel_tsatsouline_workout_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f504e3-16e9-4985-a752-fcbd82a1c998/manual_de_calidad_ejemplo_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b9752a-46ff-49c2-b3a8-eab982b00d52/88036919959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8593bf5d-38ca-430e-99bd-a7a74b76c955/jarodovejaxetakebiwaxirix.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5484 bytes
SHA-256: f29a4b9793db3d94dde73be06fb53e2eb8db1106228faf168bd5e812e4069760
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10872 bytes
SHA-256: c622ce9255da09501274352eea0ea471baf8ce318ff34358cc7de15be6c2e8d8

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