Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d349a2c3dbaf50…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4eb9e109c34405f9c2ca116db312347 SHA-1: 0a671120ffa00b724acd9fc2c61bb71b2a8bffac SHA-256: 29d349a2c3dbaf5097ba7cebcad7c894227122fbe9777bc3a93c3e2eb83ff83e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external PDF files, likely as a SEO spam or phishing lure. The primary URL suggests a deceptive search result for a free PDF download, which is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/pbw?utm_term=history+of+english+literature+by+william+j+long+pdf+free+download PDF link annotation
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/bovuzoperetesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5ff94233e5169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5fc7123e61a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60486dee6bfab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_601137b1e7622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6050d4ce212c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5ff248d82cad2.pdfIn PDF document text
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/7053163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_600d53b3b255e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_605ef68d3e9ad.pdfIn PDF document text
    • https://bejaluxixobig.weebly.com/uploads/1/3/7/5/137506446/c1dbe3b653.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/zanosezomanopejop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_601332161b898.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/9183215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff6aed57db82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_602434473a43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_606e5fcd40eeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvabufoj.pbworks.com/f/realidades_1_capitulo_1a_answers_page_200.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144999843/dragon_ball_z_ttt_mod_download.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144544449/what_size_tires_fit_a_2008_honda_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f3c6b0-9a6e-4743-bf7e-c53642136c8b/which_keurig_can_you_use_own_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ffa71f-fc17-42ad-bea1-2920532bb30b/69178718857.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144878655/winter_largo_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63ac163-c84b-408f-a016-4e14ae5c0870/biwesalufozakitilokivelof.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 5828 bytes
SHA-256: d300fcbde2b91dde45b47fc7ef720886e27810b2816824fc4a8069d1a4b680a7
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10660 bytes
SHA-256: 22eec2d0a60ec76b15d791e99882adcafc81042b1ad44bbbc2e26ba9e0614b7e
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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