Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b99fda1450cff2…

MALICIOUS

PDF

41.9 KB Created: 2021-06-01 08:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e97001261c0953f984899c68db77047 SHA-1: 06855b53ea4c289baaf06cfae316423ed90cb4fd SHA-256: 23b99fda1450cff2bf8e75422922360eacc19308658c73ec934534e6c9fd8ed4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely intended to trick users into clicking a link disguised as instructions. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6783

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/pbw?utm_term=high+key+vape+pen+instructions
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/kidopa.pdf
    • https://static.s123-cdn-static.com/uploads/4410975/normal_5fedfc71ef48e.pdf
    • https://static.s123-cdn-static.com/uploads/4393486/normal_6001333a48d49.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601fb6b0b5da4.pdf
    • https://danevetiwa.weebly.com/uploads/1/3/4/6/134600357/nawotapamef.pdf
    • https://cdn-cms.f-static.net/uploads/4392451/normal_606722a69089f.pdf
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/wufimotewuwodizi.pdf
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/paneranakori.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/05ba485.pdf
    • https://cdn-cms.f-static.net/uploads/4462056/normal_6066facfa1c4e.pdf
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/6e15427d720ada5.pdf
    • https://cdn-cms.f-static.net/uploads/4494663/normal_6011a9439d7f8.pdf
    • https://cdn-cms.f-static.net/uploads/4369660/normal_6049093382e4b.pdf
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/0689e53.pdf
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/79fac1d38.pdf
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/kezejumusajal.pdf
    • https://uploads.strikinglycdn.com/files/d320fc95-43e6-4971-98da-fdca24402d0c/4853426946.pdf
    • http://bemulopawed.pbworks.com/w/file/fetch/144444597/jogudefu.pdf
    • http://wixugigir.pbworks.com/w/file/fetch/144436773/redox_titration_with_potassium_permanganate_lab_report_discussion.pdf
    • http://pezeliv.pbworks.com/w/file/fetch/144417537/download_bluetooth_for_pc_windows_7_filehippo.pdf
    • https://uploads.strikinglycdn.com/files/05c7ae58-c8f6-42c2-90ad-cf8993dbe564/vutujiragixukokafidex.pdf
    • https://uploads.strikinglycdn.com/files/dab718c8-37f6-45a8-96f3-19fc622c9717/how_to_make_liquid_glycerin_soap.pdf
    • https://uploads.strikinglycdn.com/files/755d5221-b2e5-497e-b0ed-45a3bc50674d/faxomi.pdf

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