Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a3c915335e5f3e…

MALICIOUS

PDF

58.8 KB Created: 2021-02-21 06:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6c80c88f09b9c40c55a71fdc8b691bfe SHA-1: abd1d14ec28f9ecf0be79c12b5711bff87d4e114 SHA-256: 45a3c915335e5f3e0c44cfe4e94105680bff6f49ee13b751c16f204e257388ec
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9216

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+does+50+to+1+gas+oil+ratio+mean In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fe26797e3b85.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/3yrKgj4/judalarubofinawitukud.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/iimjajb/cross_stitch_dmc_thread_colors.pdfIn PDF document text
    • http://thefortykuti.com/gezedugobelukitorizedib7e8.pdfIn PDF document text
    • http://meetdouche.xyz/how_do_i_find_the_wifi_password_to_my_hp_printer6ejff.pdfIn PDF document text
    • http://expo-kit.ru/influencing_others_interview_questions_and_answersrxq50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc6d50c75750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b091a571c.pdfIn PDF document text
    • http://jurinijija.22web.org/pdf_editor_online_free_add_pages.pdfIn PDF document text
    • http://velixone.66ghz.com/edexcel_a_level_maths_book_1_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_5ff286ebb77b5.pdfIn PDF document text
    • http://housefashion.ru/subject_and_predicate_worksheet_for_6th_gradeo56q1.pdfIn PDF document text

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