Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd0c9429543a09f…

MALICIOUS

PDF

88.5 KB Created: 2021-03-25 10:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 53cac0ef4fb41ac35005d255bb9116b5 SHA-1: fe59b039fae156450e8c03077d661f00cecbbf4c SHA-256: cbd0c9429543a09f423a21f62b48b30341435d9f109bac0048a306a6179a5ef2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'electron configuration lab pdf', suggesting a lure to a fake educational or resource page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=electron+configuration+lab+pdf PDF link annotation
    • https://cdn.sqhk.co/zugivakizo/cbghcij/7173666948.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/ranaxefiwodofanadvvg5g.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/baras_baras_inder_raja_song_pagalworldbi5bc.pdfIn PDF document text
    • http://ueuniti.website/64375222898jcv22.pdfIn PDF document text
    • http://derewopenila.22web.org/fojuduwakozebikiva.pdfIn PDF document text
    • http://triple-doska4.club/34581500199878cb.pdfIn PDF document text
    • http://reduslimitalia-official.website/ecuaciones_diferenciales_lineales_ejercicios_resueltoscv1ng.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/zeKfBia/bushido_bear_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/hAhjgjc/46860080164.pdfIn PDF document text
    • http://ketousa.site/gta_5_lspdfr_callouts_mods7yv0.pdfIn PDF document text
    • http://mastera-saydinga.ru/first_bus_information_colchesterzg81x.pdfIn PDF document text
    • http://anyita.space/metformina_beneficios_para_mujeresa7kuu.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
    • https://uploads.strikinglycdn.com/files/f7e12be2-cf0e-4206-a662-f927dafbb6e1/88430235359.pdfIn PDF document text
    • http://vubulebutaxa.epizy.com/applied_english_linguistics.pdfIn PDF document text
    • http://roxudafemif.epizy.com/risk_management_definition.pdfIn PDF document text
    • http://popomajuvuj.rf.gd/asuran_movie_blood_bath_bgm.pdfIn PDF document text
    • http://zetowimular.rf.gd/70804725134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406bf9bf-1940-46a8-9804-ea8eba64f349/bufadukalafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cabdff7-3eab-40e8-8b11-961c56a21b6c/satofifekowamumog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9abdb1-e208-4f35-8878-474256d54a43/5623241974.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_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 5124 bytes
SHA-256: b034a3911cdb7afb827fb3b3971840c1b6f40a7c5836bbf25ef5f2b9ef188ebb
font_01_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 11100 bytes
SHA-256: 81827553824343f8e9132f3d33731637d591cb685c5bd5e4e7acdb414c92c6f4
font_02_sfnt_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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