Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce752895137e7227…

MALICIOUS

PDF

73.0 KB Created: 2021-01-21 22:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a898d29be206c5f1e4b7f722d4a7beee SHA-1: 394ba05bc9f17f51f68c9af071c2f10168615c9a SHA-256: ce752895137e722774bae4879be83e994a453c0efde2fcf26717744e7917cdb0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=dust+devil+slayer+guide+rs3 PDF link annotation
    • https://cdn.sqhk.co/jifonakilux/J1nC0hg/xatilijurep.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jajb7Ir/brutal_death_metal_radio_online.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/tawuzejuzewewitidogeji.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/i8jiict/soccer_penalty_kick_games_world_cup.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/NEtggjh/wisosivipelaliximogi.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/3719253.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/sobekalotesu.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ghBijhh/bingo_caller_program_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/KhajcnV/grass_mower_service_price.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/eSnVuia/jepegazakefivafakulowika.pdfIn PDF document text
    • http://golulim.iblogger.org/zelda_gba_emulator_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/hiHgdhj/57501235928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butaxogusevi.epizy.com/rinolidade.pdfIn PDF document text
    • http://sirusuve.epizy.com/juvekamazelavanolirifi.pdfIn PDF document text
    • http://sosozodazu.epizy.com/gustav_holst_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/beyblade_battles_games_free_for_pc.pdfIn PDF document text
    • http://bujuxuvumelijet.epizy.com/overview_forensic_investigation_report_into_steinhoff.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 5316 bytes
SHA-256: a7178d443c73d68961d6a34223b332d290f76c8368ddff69fa6b6260e3bf7764
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10888 bytes
SHA-256: 92de197fd6522fb539b0bbc40a0c2450e8819e30f3d7e6094b322dd5d3a0e586

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