Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4091dc3bdf54d5…

MALICIOUS

PDF

44.3 KB Created: 2020-11-07 12:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3c261571d637b19952e3b832dad0daf9 SHA-1: 87dd8a8f6e8fe17f2919b9748ae7967b32c9a6f1 SHA-256: ac4091dc3bdf54d59e4493b1e967903e3b03eb5828ad8dbf21e29d1eee3a629d
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffset.ru/123?keyword=grow+rpg+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f9f72742f8d5.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/5127637.pdfIn PDF document text
    • https://kiwusaxanasatip.weebly.com/uploads/1/3/0/7/130738973/motof_nereneziwo_samiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fa4cbbd47756.pdfIn PDF document text
    • https://lipitedo.weebly.com/uploads/1/3/4/3/134380968/dubuteputimijutete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_5fa31679aae54.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/zagezazep.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/a4d080d2cc50.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/adbc843e-9f73-42fb-8bb2-d8ff8dd19e7e/57884439292.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/xivaminajodefaxoxuzazig.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_off00006f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5B 5052 bytes
SHA-256: 1c79b7b1195259f9109b46def609db9ceb70a7f6b39d4d6cec4aa047c0eab48f
font_01_sfnt_off00008095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8095 10632 bytes
SHA-256: 5d443517adf4796186bc547245190ff37268349c727087528ed3ae0b64ba1bc9