Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bd787413efe1f9…

MALICIOUS

PDF

40.6 KB Created: 2020-10-05 08:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b965c1819a562a667cca48e063a754b4 SHA-1: 7b02933530e918ec46c628f86d601e6e4cb13795 SHA-256: 51bd787413efe1f95b3b5bc607cb1ef84b1bc7d2c6d23b590db2f4bc961ff047
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=onstar+antenna+replacement+parts In PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/firiworozemapibitofapob.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/15660675474.pdfIn PDF document text
    • https://site-1039813.mozfiles.com/files/1039813/64797066636.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/bejovifaxerijofukelifu.pdfIn PDF document text
    • http://jamusesu.ocbackgammon.com/uploads/1/3/2/6/132682883/5133197.pdfIn PDF document text
    • http://gekafub.innislearning.com/uploads/1/3/1/3/131379362/2b38fae6a8650.pdfIn PDF document text
    • http://files.sosinsuranceagencies.com/uploads/1/3/0/7/130738989/9669876.pdfIn PDF document text
    • http://files.mattysonmarie.com/uploads/1/3/0/7/130775048/pizaxudanifomaki.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/2656f9df-16f7-47e0-92e4-79c8c9d7e136/pelonisuwasirivivor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb5d342-6e27-409c-a03c-c29d96ebe3ff/85511727136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611e0ce0-8f21-45e5-bbe7-efe8667239f5/66563157334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9579ca2f-54f2-45af-a482-4e181d7394d3/33836929129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8158f7cd-2a7c-4f8a-8bb2-ebd88ca5b708/64269505849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1ff17c-ec78-461a-8b93-d6a8d333146d/86569654410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cf15da-47d5-4ee2-942a-b39ba1fd8e67/wisaxisitutafovasaluwuw.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 6

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_off000061ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 5104 bytes
SHA-256: bbb4e58939cfec252bb9fc3bfa659720a23b416a98b1f60aea8bad8813a73e78
font_01_sfnt_off0000730e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730E 10008 bytes
SHA-256: 13855a1661961eeff09af0146e6f93fa6911258e1f60f5532129607baf76dfef

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