Malicious PDF — malware analysis report

Static analysis result for SHA-256 8217855d9d0e58ff…

MALICIOUS

PDF

76.7 KB Created: 2021-05-14 07:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a6ddb4864975e64a4a1bed118e075a8b SHA-1: 3d0c6f4b37ae9af052c5fd69f30fa636ac3d19af SHA-256: 8217855d9d0e58ffe67633a2ca0ecb18906cd9afe56edb758129ef5eaca034d3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://kuzutuzo.ru/strik?utm_term=dewalt+drill+and+impact+set+lowes, suggest a phishing or scam attempt, likely disguised as a product listing. No scripts were extracted, but the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=dewalt+drill+and+impact+set+lowes PDF link annotation
    • http://terugate.mypressonline.com/bright_angel_trail_map.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/edital_auditor_fiscal_df.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/laboratory_equipment.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/4779491651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe26785e1a1d.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/a_level_maths_revision.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/razewutaxisivegafaki.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_605d7fd8c7828.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/ernst_haeckel_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_603fe77409424.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/3b0c34fd-c22f-4559-b9e9-308b93543f94/29064140043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ed4600-b9c7-4c23-ba26-2a2d5830a52f/bodas_de_sangre_federico_garcia_lorca_genero_literario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dd10ec-1261-4960-ac15-84fa224b5350/think_like_a_freak_chapter_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aaaddf-3e2b-45f7-8064-7a07b2a97241/amazon_dot_operating_instructions.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/catalogo_avon_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d4151b-f904-49eb-b261-665ef7c36909/jesidaritolano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a23d19b-1966-4020-bbde-ad7c48734622/51569375902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e9103b-3725-49ba-8ae5-eddeb79a8f29/gupabanabo.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5308 bytes
SHA-256: ad9d9d67f1a82de5e52b7b4ba0a8d47e02894a3e59b60d80e66d6c8965440ed2
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 11980 bytes
SHA-256: 031209c876397b8644277e75b66a1065178703967d36dcb465f2850380a8f9da

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