Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caf1e3e9104e7cf…

MALICIOUS

PDF

44.1 KB Created: 2020-11-06 20:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 63077fec33644c515648872f6ff6654a SHA-1: 6207b4e3be22a8ee57a4e662b22e717ba8cf20a0 SHA-256: 4caf1e3e9104e7cfcdb746581a02919dffe5cf87f382df02be390b6397a05334
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/2788914.pdf.
  • 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/aws?keyword=employment+guide+newspaper PDF link annotation
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/2788914.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/nutokekelomalek.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/40deca2afad8b.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/4e237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f8e5c82b5be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f90a623d7010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fa35b8839712.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/65471518-0cfb-4e13-a5e3-66f571ad08d2/roduxovotutufefezex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e91a0fd-ba09-4f16-8242-489852f2e95b/54502689550.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a579721-914e-4b01-99d2-25c797891bac/lopogu.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_off00006d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 5432 bytes
SHA-256: 4a6630262281c61e174185537ce7c734d153a2bf8b44192c0bb4e3308b4af36c
font_01_sfnt_off00007fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD3 10708 bytes
SHA-256: 89d72ff2d9d1ee9472b730d2055ba5ca657100daa1be2e5c21a572bb99236315