Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8ebd8a9867165e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 02:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0496a97880c11c17f6a4cc092eb46bbc SHA-1: 9b30f4f64c1444cb7390db79abdaf1222b055bea SHA-256: 7c8ebd8a9867165e4ad1bd9ba5f3f699c407f926994257161499715448ec6946
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://vilenefex.ru/award?keyword=animal+abuse+articles+pdf, appears to be the primary lure. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=animal+abuse+articles+pdf PDF link annotation
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/wisizovura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5fdc411631816.pdfIn PDF document text
    • https://jaxanawunolat.weebly.com/uploads/1/3/0/7/130739567/kubudixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371258/normal_5ff8656c2cb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60552c364b9b2.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/7915a7b1754159e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5febf9ff783d8.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/5738558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fe611ef91daf.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/gasixap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_185428324b6c484a8d9188fb1a4cb355.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98466242-0cf8-4f9c-a143-42c6f108c64a/how_do_i_find_my_national_id_number_on_drivers_license.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_bc7a27e1f3354ab0a97b499b6cc8c74e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6079ab08-e722-4e0e-8c10-a699014f1c97/79604498779.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_07e24699b65b4414b4677b1589ef5014.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_a3d67a47f64646889d1de34146491b11.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_688a5f891e1847a688693fb3545b9fde.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_08d1d538439743e184db346eb5356237.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_bb9d062b5ef3426590a5c0aa0354a106.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_142c38d1f9c24096b144e102b2125c17.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f8e7ce5237fc48dfb48e5cdd71d21eef.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_76510c39cc6647558921cb818765c7e8.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_a3987d4b4e764fabafdcb1a931d76920.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/787e9ed7-bbfe-4528-8d7e-4fb287db0a56/rules_of_multiplication_and_division_radical_expressions.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_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 5432 bytes
SHA-256: 2d94d45a79ce030742e53575c1df3af820b3e8f2c2ce8754b1a7750cf299b5f8
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 11420 bytes
SHA-256: ba77f02d8c72848de8b3466502ff6ef2c510b74be2f4ad81b424ebb297781c21

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