Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca74a3eda7683527…

MALICIOUS

PDF

58.0 KB Created: 2021-02-22 13:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b44b6b98530eff70d57c6f7d21d39754 SHA-1: 8a9b0c537163e967e630d871e5937f3290deda35 SHA-256: ca74a3eda76835273db5c971ffbaa0a690f26654216d8713e1611be2bfb75d2a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The primary lure appears to be a fake software download, as suggested by the URL containing 'sketchbook+express+pro+apk+free+download'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9515

Heuristics 4

  • 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
  • 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://seumenha.ru/aws?utm_term=sketchbook+express+pro+apk+free+download PDF link annotation
    • http://espaceclient-cmb.com/14335274727dncw0.pdfIn PDF document text
    • http://harmony-market.ru/57865154612tgrrb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_6011760d90273.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/gikivgj/cut_paste_photo_seamless_edit_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5ff4510769479.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jhifAhf/photo_editor_for_android_free_download_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_6008b6a7306f0.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/ajcjb4y/mastercraft_prostar_2020_price.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/ehjifei/new_pop_rock_music_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6019212fc17f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_6025619ba3b10.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/gvijmxK/90690500507.pdfIn PDF document text
    • http://fruit-ita.fun/cfa_level_1_formula_sheet_2019arjeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/DgffehC/rc_heli_flight_simulator_for_mac.pdfIn PDF document text
    • http://kebodilumikida.rf.gd/nibozibugun.pdfIn PDF document text
    • http://nigiragesowujow.epizy.com/23325146763.pdfIn PDF document text
    • http://kipixuge.epizy.com/80215378623.pdfIn PDF document text

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