Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cfb659c0a16e99…

MALICIOUS

PDF

73.7 KB Created: 2021-05-12 04:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e125988481ac8fac4208d782e7e2e98e SHA-1: 2d877cf150c8879aaecfe68fe1b143fd07b56c7f SHA-256: 96cfb659c0a16e9941980765478514e5e21cc1156999b63082ef64d395c250d3
136 Risk Score

Malware Insights

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

The PDF document contains a heuristic indicating a browser extension installation lure, suggesting a social-engineering tactic to trick users into compromising their systems. The presence of external URIs, including one pointing to 'mezovuduw.ru', further supports the malicious intent. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious behavior, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mezovuduw.ru/strik?utm_term=can%2527t+change+default+search+engine+google+chrome PDF link annotation
    • http://avlto.best/fawubexikupupesokuxiduggm0ji.pdfIn PDF document text
    • http://fito4ka.xyz/72407825017v63og.pdfIn PDF document text
    • http://afracheat3.xyz/alexander_the_great_movie_with_angelina_joliesgr6f.pdfIn PDF document text
    • http://tusukezilineji.66ghz.com/slope_line_equation_worksheet.pdfIn PDF document text
    • http://songkfrk.site/3125252860739838.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/bededuxotulapil/ftse_all_share_index_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/kufowiletazi.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/kosuliwovodizuwotasipa.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/cloudy_with_achance_of_meatballs_cast_and_crew.pdfIn PDF document text
    • http://rimadijek.rf.gd/36111175352.pdfIn PDF document text
    • http://pusisokomadebi.rf.gd/how_are_organisms_classified_into_domains_and_kingdoms.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/92996097097.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/webukurububodojerutizidaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/diary_of_a_drug_fiend_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/epileptiform_discharges_during_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9e88ae-2cd4-4beb-8f29-3981da6e0896/95799832878.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/two_long_parallel_wires_fixed_in_space_carry_currents_i1_and_i2.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/it_is_called_the_age_of_reason_classical_period.pdfIn PDF document text
    • http://turebegifazuxa.epizy.com/how_to_bulk_up_on_paleo_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/androids_and_aliens_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d3135b-af51-4b3f-bc9e-a71fae2f4925/73125659981.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5376 bytes
SHA-256: 4069f51dac70d74040f01119e0f663a3eceb38cb68fda853c8a4766d7304a8a9
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10740 bytes
SHA-256: 82b63c2825fb4a9847513c8620ff4020a5da2d6d02b5c4a897bb852e6098b143

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