Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d4ce89818d0c95…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 07:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c0a3abae825e557fd5cfb8e6d3001e SHA-1: 7b987a5e06b06b24714903e6240e439222922625 SHA-256: 26d4ce89818d0c954f3c8e45f8413002139991ef3ee116513e5924a9bb817413
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one notable example being https://kuzutuzo.ru/123?utm_term=el+jarabe+tapatio+sheet+music. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=el+jarabe+tapatio+sheet+music
    • http://bidimiw.sportsontheweb.net/94853631784.pdf
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/7952d940a5.pdf
    • http://wotidoteked.mywebcommunity.org/carcassonne_expansion_10_rules.pdf
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/ebb384fd458531.pdf
    • http://zumufufup.sportsontheweb.net/xavaxerugu.pdf
    • https://kafubururi.weebly.com/uploads/1/3/4/2/134235359/gepomol.pdf
    • http://zibanozoxepezu.iblogger.org/5965250783.pdf
    • http://netolenogafa.getenjoyment.net/separation_anxiety_disorder_dsm_5.pdf
    • http://pufivuziviv.mypressonline.com/anthony_giddens_sociology_8th_edition.pdf
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/7182461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xonolori.atwebpages.com/30976006871.pdf
    • http://torasimi.rf.gd/3366968160.pdf
    • https://s3.amazonaws.com/fofeguj/how_much_is_a_2012_camry_worth.pdf
    • http://sovizaz.epizy.com/mark_sheet_in_excel_download.pdf
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_acd13206a4ca4b87a09e03983f27541b.pdf?index=true
    • http://nipizil.epizy.com/comments_and_jurisprudence_on_obligations_and_contracts_jurado.pdf
    • http://sugunava.epizy.com/zabowarowofodasum.pdf
    • https://s3.amazonaws.com/xalexojaxipud/ideal_team_player_book_review.pdf
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_52889b0856074eae95ae19aa57302773.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eace.bin
222d24b015d248ff3f447639606fa52b78915111816f5388497addda9bdeab66
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 5348 bytes
font_01_sfnt_off0000fccf.bin
08f334f8070fd23d55a2dc74dbee2043ca0ecf0335edf36ebba307f6f7306eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 11648 bytes