Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c1d3ace06fdbc3…

MALICIOUS

PDF

42.0 KB Created: 2020-11-07 17:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 5e6c55c732233a5a5124aaf6078c303f SHA-1: ab57215173062fb4e602433da6fe10df8bd3a532 SHA-256: 71c1d3ace06fdbc341877dcc9e8babf7f81dbdae1b43686f26ebf2aae342fec2
166 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffi.ru/123?keyword=hotstar+app+free+download+for+pc+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fa21fdb0eefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f9114f1f0b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_5f9628e94f3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5f9f044cef797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fa52abc8ca67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zusepofofone.files.wordpress.com/2020/11/zelatagapalezufopeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14dbbff-390b-45ec-a0ad-9d681afd55c3/liziranep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaa7e38-9677-46ad-a33d-dad34b3db24b/dugekawifebajorimowuzes.pdfIn PDF document text
    • https://firijidu.files.wordpress.com/2020/11/89693160377.pdfIn PDF document text
    • https://vivuvegutofo.files.wordpress.com/2020/11/71330355521.pdfIn PDF document text
    • https://gikusasovi.files.wordpress.com/2020/11/68177414543.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://xudunirefur.files.wordpress.com/2020/11/garimosiluwumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45e4c58-53cf-417c-905c-01c95da79122/17557617347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beede1e4-92d0-43f4-b43d-3566674b7c17/vw_golf_tdi_manual.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_off00006377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 5396 bytes
SHA-256: e53c8367da64b3345fe973cd2e848452d5635f7fb4214921d7cea71c518a6f5e
font_01_sfnt_off000075f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75F4 10996 bytes
SHA-256: 1cef1582a58d2d6e6937ca78458e36b138c4487de6fc5b9771cdbe4111c0b073

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