Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc1afc04fd2ba3c…

MALICIOUS

PDF

95.6 KB Created: 2021-06-06 00:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6128dd19f2dccfaaa9ed7a9c1b076792 SHA-1: cb49daa3d235b3444d4160e378218f27a3da0b32 SHA-256: bdc1afc04fd2ba3c1480d58bbf76d2318f3f2b63937019a0deea7aac24bddffd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a link farm and a phishing lure, directing users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URL and the heuristic 'SE_LOLBIN_RUN_COMMAND' point to the document's purpose of redirecting users to potentially harmful content.

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
  • 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://krisoc.ru/pbw?utm_term=how+to+log+into+minecraft+education+edition+without+school+email PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374517/normal_6007eb7ed021a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5ffb8b166feff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_6010108d80dbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5fde60ba12d5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5fd0fad600a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6038b3c107102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_602d0084bb0ba.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4392869/normal_601887cdbc614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_60641333640b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc977d4f224c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_5fe343a562aac.pdfIn PDF document text
    • http://ridelox.pbwIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8a9aa2-0887-478d-b97a-e2242c1163d8/advantages_and_disadvantages_of_deductive_and_inductive_research_approach.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144628020/sokajib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd8bb4c-e1ac-43dc-8465-8665ecde2d9c/bubinevalatuxepatopu.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144460863/how_to_download_tutu_app_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75217e8b-1110-45dc-b069-648291aadac9/toro_personal_pace_mower_repair_manual.pdfIn PDF document text
    • http://vazexetuv.pbworks.com/w/file/fetch/144565248/i_could_not_stop_for_death_meter.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144442905/como_eliminar_cuenta_google_de_hisense_f23.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1e65a1-c7c6-4d42-b52d-9491b4c3aa4a/how_to_use_proform_treadmill_without_ifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7da07ad-4fad-4f83-8c86-d03ffe110298/rip_curl_rifles_midsize_tide_watch_manual.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/34699945874.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/150727233.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_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 5488 bytes
SHA-256: 9dcaa4f4183e13c5dea7892e89faa282e51aa86518a1411da891253542013e1b
font_01_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 11380 bytes
SHA-256: 895569ad675a4fdafbd5261dba376e11bce2be1b8135fa5eca0cf35956a31ac5