Malicious PDF — malware analysis report

Static analysis result for SHA-256 c291c4da0d58b7d0…

MALICIOUS

PDF

82.8 KB Created: 2021-04-02 22:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 56684ea2ba08516098fd460c9b03a6df SHA-1: 6d504dbcef661baec1371c18fd92e1c3a37d578c SHA-256: c291c4da0d58b7d0e3b6cd35def0be3d09d25468185477fcb43e41510330be58
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack designed to lead the user to a malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=dire+tiger+miniature PDF link annotation
    • https://cdn.sqhk.co/xovikojux/iigedib/los_mejores_traductores_de_idiomas_portatiles.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/egebIii/colorful_cross_stitch_kits.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/2ia9hae/tebegitenura.pdfIn PDF document text
    • http://huaweistoreukr.xyz/22904362309l80eb.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/jD7Ch5T/kirchhoff_s_rules_problems_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/hjjeH4U/70493467220.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/aicphdN/beat_the_puppet_mod_apk_unlimited_money.pdfIn PDF document text
    • http://devlp.club/495871387417izh6.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/ggcieoC/nearby_chat_app_download.pdfIn PDF document text
    • http://pornbustyvids.com/sivasesemugofezasq8eo5.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/jkMdFqh/fibenozawape.pdfIn PDF document text
    • http://liwojabegeje.iblogger.org/befupipagufizurodaken.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/kkU4shi/nigatarabuzemamaliraro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faxaxos/wifiluzimisogaguratabex.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/cape_town_tourism_information_centre.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/44242690795.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/what_is_a_positive_gdp_gap.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/pengertian_behaviorisme.pdfIn PDF document text
    • http://sisizovomejefi.epizy.com/kenmore_elite_oasis_he_top_load_washer_manual.pdfIn PDF document text
    • http://rufuregebedus.rf.gd/14193232185.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/constantine_bay_surf_stores_surf_report.pdfIn PDF document text
    • http://sesitalanewu.rf.gd/94738050815.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_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 4796 bytes
SHA-256: e2c8d66878e6a7d4c4ec02e81a939455ca7c38a39f3ca8dcb8d1950701ed0dcc
font_01_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10560 bytes
SHA-256: 703b234b00763f8a0a85c11a23bf4ccadb62879068fbef81753ea6642401db23

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