Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a5f09f5f5b5350…

MALICIOUS

PDF

66.8 KB Created: 2021-03-01 19:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: dffe281382ae9fff1c1018da1de21a9b SHA-1: 5ee1fbc5318813a4114cff21cfc6c8dfc2f27ad5 SHA-256: 25a5f09f5f5b5350f59bcb405dfa929838d6d642b8748c7fe3ea5fa7852ce541
226 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=epson+v370+treiber+download+windows+10 PDF link annotation
    • http://pawomodom.medianewsonline.com/windows_powershell_commands_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/iiicmib/85613196824.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/bonigepowerel.pdfIn macro / runtime command snippet
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/radilofo_gavafifosuv_getemosixap_zalivenixiku.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/ec128b3bb8b156.pdfIn PDF document text
    • https://dawijenumekoxel.weebly.com/uploads/1/3/6/0/136087820/4925964.pdfIn PDF document text
    • https://juzowesefuzifi.weebly.com/uploads/1/3/0/7/130775985/sapir.pdfIn PDF document text
    • https://seduzitatadobi.weebly.com/uploads/1/3/4/3/134371103/kofugoxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5ff88d35a24a1.pdfIn PDF document text
    • https://cdn.sqhk.co/kuseIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekujefil.epizy.com/57833734563.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_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 5640 bytes
SHA-256: f0cb790aeec20ff59c6da173864b465a0fc8f8a48c0cf0e42c18a028ab0b476c
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 9888 bytes
SHA-256: 7750c54b5f697a383497c2a1320f799cea27fd6b169210c4d73407c1a0219672

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