Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c91f1dcb2c4616…

MALICIOUS

PDF

42.9 KB Created: 2020-10-27 05:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 95416223ea21eea27420ccc6e8c3681d SHA-1: c3f3aa3e12c930f785c511e50af61ff788bd541c SHA-256: 21c91f1dcb2c4616c1779b3fca64c331cf0ec67fb10bac8d402703546f3e7cea
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://ggtraff.ru/123?keyword=big+bang+theory+pilot+full+episode In PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/c22f8.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/jaripobesivas.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/japexovizabid-bomosewefum-kujimisix-givirako.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/vepulakanug.pdfIn PDF document text
    • https://bozofuki.weebly.com/uploads/1/3/4/3/134322044/9306317.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/e20d9cb3f5.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/jizogirigodajaxujuw.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/zolejotuluton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f90905ae6b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f963958cca5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5f8dd3bc83aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f875d40d5d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5f9780552bd84.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/997235.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/tovuxabigizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f89f2074f677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8999f779c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f8f2edd9ea44.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/455987d0-2487-4d5c-b5c0-3900ecc2eb04/19277343244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d257a7-40d2-4be8-bc79-112d3badba02/jasakexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ae79f5-4e13-4e44-a10a-75456da2c876/gajufobasefesutili.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_off00006846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 5592 bytes
SHA-256: 7ec917e926d65a99ba349dd5032b580e25e2cc0d5a6348afecfb4838872120ec
font_01_sfnt_off00007b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B43 10304 bytes
SHA-256: 8ffcc5e574212f3113fdfcb58ba122ed1aefe317ac459de24617eb9f3093e37e

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