Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ee4ecdf62ad102…

MALICIOUS

PDF

83.2 KB Created: 2021-05-22 22:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 728ec02febcd64c5dfdfbd022cee6794 SHA-1: 789422bed3139b4d7c5156e17400af6fdfb1fde1 SHA-256: e6ee4ecdf62ad1021be445f5478f3a3867cf6b5ed6386c146bbc2e4c7f28b6b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+operate+power+wheels+wild+thing PDF link annotation
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/zobitodusijesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_602f865b60e5e.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/xuluxam.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/f89c1a0c174.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/1398701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcbaf7e8cc4a.pdfIn PDF document text
    • https://wigojakumadofef.weebly.com/uploads/1/3/1/6/131606024/ed865a5b9.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/01b5185fea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424991/normal_6001a122cb7af.pdfIn PDF document text
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/vezerubesumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fd7b4890f275.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/606dbc67-2c60-4cd0-9af3-3b959babd7af/34795361394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa980b8-a09a-4838-a5b3-57e2468aedc2/what_is_chapter_11_about_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7618b978-6e00-4e50-a4aa-6c743f8e8f8a/wu_tang_concert_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e386ba-9ef0-4c51-a6b4-e9800b4275e4/7_habits_of_highly_effective_students_lesson_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992e15bc-3b95-4b88-bed4-10170567a454/how_to_reset_timer_on_pentair_pool_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b94bca-e714-44a5-beda-cb638a7c2cbc/family_feud_questions_funniest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c62328f-564b-43c2-b8b9-b6d9b0ab00f1/what_size_hole_can_bats_fit_through.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_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 5272 bytes
SHA-256: dc6674041fbce57d55aeed686d817154fa42cd7304e6d8866ad54f6f319475a4
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 12392 bytes
SHA-256: a61b3fb14727bf5df16111916f39a3d5f664e2f77c7759e407c52c62b80c6283