Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c84c66c99a390d…

MALICIOUS

PDF

76.2 KB Created: 2021-04-10 17:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d5b8d50bd146f38b05cfde6bae4c6d52 SHA-1: 440f2e3ff3d3be30b237677adfc37a82aa0ec513 SHA-256: b3c84c66c99a390da4a9e6047fbf75c7575fb1908dfc3e92e2eac4e3d433456d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and includes a URL that appears to be part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic suggesting a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=how+to+pronounce+cerebral+palsy PDF link annotation
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/62d7faf32.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/4365890.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/xuwutubar.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/notafati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_7927bf8dc65b4e299b310417e2a8fcb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe2d263-44fe-48a8-8b7a-5b061437e1e9/45968533814.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_ea77fa6482a048aab0b9e08920a00513.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea3281d-9fb9-4a7b-ab8b-f9db94665f85/perdido_street_station_artwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d6545b-350f-4e0f-bca4-7b4b2c0bb676/38561324691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7858164a-8bd5-4854-a774-5cf1fcc31940/rokinovaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddfc623-9208-441e-8806-9f249286ab85/52400197590.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_99f7889dbc3a43678330cd611a993281.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dae301-cb95-409c-abd6-4e129624b7a8/how_much_is_a_ps4_at_walmart_on_black_friday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2892b6-7a18-4966-b840-2edac622cfff/13123769433.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d27e329b78ac4e52af3051aa8b5f6372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c54be7-c3b5-40d7-a99c-3f3977b54d5f/where_can_i_take_calligraphy_classes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a98ed0-067b-4dfd-a059-1893de1908a0/dazikev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8705cb-8593-4cb9-b925-0f9af553258b/gewunadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b729a20f-7982-4a56-a1e1-c927eb9ec5e8/dopugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cb3fa5-393b-4d23-bde5-a07abec19969/pre-_reading_activity_for_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab30173-a91b-4d45-a972-16e1eb5bc9cc/xuzozibulikof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d3c7ac-e1a8-4205-b360-bce326148cd9/why_does_my_electric_oven_not_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b052f6-b019-43ca-bca5-d690fafbf575/polk_audio_subwoofer_manual.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_11c6587f7c9442faa07e6075ced1c1e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc23b40-17d6-442d-8483-36ea64eca21f/what_is_the_population_of_the_cherokee_nation.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5220 bytes
SHA-256: 8e48620f380be91e96e9ce77c203252c3761fd5da455ba7d61269111f27b40ea
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11132 bytes
SHA-256: ea9e5bb4d236535d23a9749bf32d109c010ba46ae14bf44defd142aa50859046

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