Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c98db6363e490c…

MALICIOUS

PDF

60.5 KB Created: 2021-02-02 15:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 554e7bb8034a208f40a96b95bfc94f5d SHA-1: 146fb3373fc79f07fcb28493c740567940bef77c SHA-256: 33c98db6363e490cfd5d0e993f4d2488a3dcccc86e3241c0f1662c17eccf01fd
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=hkust+academic+calendar+2019 PDF link annotation
    • http://goldstein.berlin/cancer_research_uk_logo24518.pdfIn PDF document text
    • http://roskycnmx.com/vr_dead_target_zombie_intensifiedot1lx.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/487cc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5ff637d8c1c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5ff545b5b3cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd171be1f14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_601883e28de9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5fd3450fa2a10.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/varasegozunapoxuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fd6de685f822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fe3b0bf25940.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/pumaluzage.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/domosugakipanuba.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/765e6.pdfIn PDF document text
    • http://alcozerox.com/the_code_book_simon_singhi6nuq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 5592 bytes
SHA-256: 752dfd58ee6b2175c751e16158f62b97ea0dd64d24aaee1abd76b7129b634f54
font_01_sfnt_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 9196 bytes
SHA-256: 20d781c99fc61fec099ce3f0ae0d55c8a9c7f9974f2d4c7803cc628f91d2c315