Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12dabe9c6b1a1ca…

MALICIOUS

PDF

82.9 KB Created: 2021-03-03 22:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8d272147da0eed406318fd0af295369f SHA-1: 29fe47fefdb178f377a48b8d35910b2f70519f1c SHA-256: f12dabe9c6b1a1cad17abf990432b334e2cc840dace98540a136088048ff7824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for Pdf.Phishing.Trojan. The embedded URL https://pelibifir.ru/strik leads to a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and external URL indicate a malicious intent to redirect the user.

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://pelibifir.ru/strik?utm_term=different+kind+of+knots+and+their+uses PDF link annotation
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/kobob.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/3202c6eb6e8.pdfIn PDF document text
    • https://roponisuzarepi.weebly.com/uploads/1/3/1/4/131452815/jufegazi-mejareku-dasavos-vamotuxafi.pdfIn PDF document text
    • http://tuworiki.22web.org/apoorva_raagangal_tamil_film_songs.pdfIn PDF document text
    • http://gakivako.iblogger.org/molecular_models_bonding_lab_answers.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/sakaburepagase/calling_app_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/tecumseh_small_engine_surging.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/natigufuzadigupi.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/why_doesnt_my_water_heater_turn_on.pdfIn PDF document text
    • http://fesemuk.rf.gd/broadsheet_melbourne_this_weekend.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/vetijagoxenuneniruke.pdfIn PDF document text
    • http://sumimubilopane.rf.gd/gitemanowifogodu.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/varejeremepokozam.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/state_of_tennessee_incident_reporting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/eeo-_1_reporting_requirements_2019.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/rogezefegegubavugi.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_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 5024 bytes
SHA-256: 8a488541e2336fa50c396c0cbad9d54cf30152b084e2d46626127764dff564ca
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10364 bytes
SHA-256: 3699a26f9b52d93e4525c2526fef7c0cd60961390e3e98ec943db8c2b8807801

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