Malicious PDF — malware analysis report

Static analysis result for SHA-256 726ef4e3a269f493…

MALICIOUS

PDF

41.5 KB Created: 2020-09-30 18:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b5d8db75b4ce4bf250375e0469859f2f SHA-1: 7934999e54a621fe615cf94fef461d567efe5cba SHA-256: 726ef4e3a269f4939c1f0ffb2c6326cc291b0eb43fab0c5dc45669e69ca71ab5
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=list+of+adjectives+adverbs+nouns+and+verbs+pdf In PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/jodude.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/gerewoda.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/kaguwor.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/wezixabufidiv.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/13435231328.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/17479619350.pdfIn PDF document text
    • https://site-1037842.mozfiles.com/files/1037842/69463111339.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/82432831898.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/92352976925.pdfIn PDF document text
    • http://files.epistemy.org/uploads/1/3/2/6/132681969/0c18ed.pdfIn PDF document text
    • http://files.jonascain.org/uploads/1/3/2/8/132814239/bijulatolo_tojasozixa.pdfIn PDF document text
    • http://rapov.nctroop319g.org/uploads/1/3/1/4/131411341/gutagow_dijodedik.pdfIn PDF document text
    • http://files.seniejiamatai.lt/uploads/1/3/2/6/132695242/wapimabalumof.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/00d0372c-ef7e-48e6-8433-620ac4bd684e/vikesiwifed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8080f7af-f38f-4080-9878-ca8f3c4f8918/71217707687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51ef6de-7ec6-45f8-81a9-3f9af732a926/81611129942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2c259b-b84e-44f6-b043-5dcdd3b45dfc/23517629629.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 5336 bytes
SHA-256: c1e829a1aff41c9d6271cada78e87ec43fb8a89e0fed5883e4057b61bc43fd76
font_01_sfnt_off00007687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7687 9948 bytes
SHA-256: 71fda1399e1c85dc07fdfb984cbe490b1110eb01748028aef8cfb742cde429b1

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