Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ba233787f870c6…

MALICIOUS

PDF

89.6 KB Created: 2021-02-22 23:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 031078423676bd17887bdd3230baba93 SHA-1: dbead7a191896d49c486de02cec0fe251f227b85 SHA-256: 23ba233787f870c6c3f99516f8d7d672bbf88ab888d463f646dd9c02f03afa7f
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier. The presence of multiple external URIs and the ClamAV detection strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attack pattern designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=cheats+starcraft+brood+war+expansion PDF link annotation
    • http://getchambre.xyz/assistir_globo_reporter_de_ontema5d00.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/4ef99c237f9.pdfIn PDF document text
    • http://mishgen.com/38360540087l3u1c.pdfIn PDF document text
    • http://counterman.ru/finadadit1olz.pdfIn PDF document text
    • http://gobigs.space/buviwurerugiweduzivizww02.pdfIn PDF document text
    • http://vk-settings-change.online/merufulefok3x7ae.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/6347250.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/remote_server_administration_tools_linux0ij37.pdfIn PDF document text
    • http://mirror-x.org/dragon_ball_z_ultimate_tenkaichi_3d_modelsxifr3.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/nivatepadixuveba.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/togukidujabitobuvade.pdfIn PDF document text
    • http://uaportal.site/67976196683itrod.pdfIn PDF document text
    • http://voralijoxiror.iblogger.org/78986422875.pdfIn PDF document text
    • http://pixxel.life/nystrom_desk_atlas_5th_editionldwb7.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/algebra_2_practice_problems_and_answers.pdfIn PDF document text
    • http://creditscorefix.info/sql_server_inner_join_left_join_performancemcc18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nowaginog.epizy.com/22407416332.pdfIn PDF document text
    • http://dikuwipesunebo.rf.gd/evelyn_evelyn_piano_sheet_music.pdfIn PDF document text
    • http://togewogovimome.epizy.com/imperial_measurements_conversion_worksheet.pdfIn PDF document text
    • http://gizegojaza.rf.gd/marif.pdfIn PDF document text
    • http://janosunitemixe.epizy.com/ac_dc_ballbreaker_album_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 5320 bytes
SHA-256: 7b5f58b8cb80d7ca915eb522c50f7e2fc58400ce556defb608914ee286a5ba6e
font_01_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 12860 bytes
SHA-256: 236466d588315e149007088a61884c8c42972dc8ce0131dc8b611ad6493a3371
font_02_sfnt_off00014ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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