Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bf33b5917848e9…

MALICIOUS

PDF

69.9 KB Created: 2021-03-06 11:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 220819acc5c6cd3ce05534fff04a513e SHA-1: 0278e145f2e2fd6a6cb40462a2c2aa3870f64740 SHA-256: b1bf33b5917848e9cd806a0259de2cc0e36b49a4c9cdd557bb863884acdc87db
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, appears to be a lure related to language definitions, directing users to external sites. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9035

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://dugedepap.ru/wb?keyword=definicion%20de%20lenguaje%20segun%20varios%20autores PDF link annotation
    • http://nejozewowedona.22web.org/amalfi_coast_maps_and_visitor_information.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/viagdha/99167272988.pdfIn PDF document text
    • http://prostotit.site/significant_digits_addition_and_subtraction_worksheet559wj.pdfIn PDF document text
    • http://arendaavto.taxi/911766375683utg2.pdfIn PDF document text
    • http://finansi-7.online/antoine_equation_constantsr05gd.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/Cijzeia/94578732985.pdfIn PDF document text
    • http://geponimodenebev.22web.org/kisotaso.pdfIn PDF document text
    • http://leworowotamab.iblogger.org/how_much_does_a_westinghouse_55_inch_tv_weigh.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/gc8jdii/jupiter_retrograde_2020_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/gi0chgg/44420081622.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/icfghhc/photo_vault_app_recovery_android.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/44841169210.pdfIn PDF document text
    • http://solovusuzuvise.epizy.com/voltaire_candide_ou_loptimisme_chapitre_19.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/solidworks_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/laramie_project_play_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/blood_pressure_by_age_chart.pdfIn PDF document text

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