Malicious PDF — malware analysis report

Static analysis result for SHA-256 8681c4dd65cb44a4…

MALICIOUS

PDF

49.6 KB Created: 2021-03-09 11:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a2c285578d5f51d168451b5ecf19994b SHA-1: a20e16fbe38e97eb52442cf72357317b5e001bd5 SHA-256: 8681c4dd65cb44a4a5dffd75d881cfd15b0192cc5235581b6f772bb1dba0a068
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a phishing/trojan. The primary malicious URL identified is https://nipisod.ru/strik, which is likely used to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

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://nipisod.ru/strik?utm_term=does+the+force+of+gravity+increase+with+height PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500453/normal_6020d16feaa22.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/gchcjb6/days_cash_on_hand_example.pdfIn PDF document text
    • http://podeves.xyz/46525750793n0lx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fd1c8a800d0d.pdfIn PDF document text
    • http://contentmedialiteracy.com/zegutubunurijambg7ma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_6000579514b81.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/eFjbggN/tmnt_rooftop_run.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5ff43f7bd6e69.pdfIn PDF document text
    • http://maxist.ru/420463914312abwj.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/idGriiy/40705752960.pdfIn PDF document text
    • http://freshmind.net/204491956982on4c.pdfIn PDF document text
    • http://raisinshq.pro/nupisetoganibiiehev.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/33710739969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a960e01-f108-4aaa-9ca2-8adb6b554377/67919139312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f416e18b-f362-4002-b5e3-9a6bf9981bd6/mivalazifepefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/emulator_gba_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e0d691-efd1-4a9c-8974-59a9d8c584df/new_beauty_launches_may_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/wadir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a92f83c-dd36-4725-b8f1-189c8cd730d0/92328016286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58daa791-3b64-4a75-b439-20629cd273ea/venugabotodur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1746161c-729f-4c57-a9dc-bef92bcda7f7/dukake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138b8741-7c00-4469-80f5-1b1b4c120e97/polder_kitchen_scale_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7960ba0c-9762-47ab-8454-a0df32537bf0/terimisurutemixodoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0358d6af-ed43-4210-a96f-e24f06ff4786/rangers_apprentice_the_royal_ranger_4_the_missing_prince_read_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/abs_plastic_sheet_suppliers_in_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/vampire_diaries_book_13.pdfIn PDF document text

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