Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb36b4dbd5f9bbd…

MALICIOUS

PDF

56.8 KB Created: 2021-03-28 20:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 759dcb4dd73cd35122e39c3eeb1e9f75 SHA-1: dacb3b69e3e3b2ddd7d77bd18d501575c9607bb7 SHA-256: 5cb36b4dbd5f9bbd14b90fbfdaf143791356ac52b57a07253bfb7e6df0c76acb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier also flag this as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7005

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=enterobacterias+pdf+veterinaria PDF link annotation
    • http://sazulido.medianewsonline.com/98213282989.pdfIn PDF document text
    • http://shmelev.pro/what_is_the_best_weapon_buff_in_dark_souls_3k2dlk.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/92649529016.pdfIn PDF document text
    • http://doordash.fun/pukuvejukpmgo9.pdfIn PDF document text
    • http://p-kavkaza.ru/how_to_change_time_on_citizen_blue_angels_watchm3n86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_60152092c4950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_6027e545749dc.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/4QLZKif/935048475.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/1icjbLC/32875750531.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/Vjajchi/free_templates_for_brochures_publisher.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ibjbzgc/brain_up_knowledge_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jYiahcX/98300076366.pdfIn PDF document text
    • http://naranosufok.atwebpages.com/edit_free_download_windows_10.pdfIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_f38b2a596fcc46baa429cb53857142af.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_81fab856b4ac44fead18eb11b4549cee.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_978f35b6a63b4315a0fd1bfd0f3d3739.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_2ff8e981f74d42fd820896e6a3ca7c91.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_d4b516a4acf8425eb484ea7c9faddc53.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_3d6e0faf44584f6691b730d391994d61.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_a65b9168720141e196942eb15bcf3864.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_89daf879a7064ec18346f2002795e566.pdf?index=trueIn PDF document text

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