Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c40d8d10db245a…

MALICIOUS

PDF

50.6 KB Created: 2021-02-11 16:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d80d9b9b8f3ada9a590040fbb871b0d SHA-1: e933cd135e3fc8b4c1efd36af78a10a51bdc2f30 SHA-256: 31c40d8d10db245adffa86f7739a4c2d75e69d3f77828118341173973a403e62
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing a clickable link to 'jacksth.ru'. This URL, along with numerous other embedded URLs pointing to various PDF files, suggests an attempt to redirect the user to a malicious site or initiate a download. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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
  • 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 50 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://jacksth.ru/aws?utm_term=spotify+apk++offline
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5ff59f761b5b5.pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_602305d63c5f8.pdf
    • https://cdn.sqhk.co/nefakovuwot/hhaJieZ/60062524979.pdf
    • https://cdn.sqhk.co/poladejug/hhhUa2I/custom_bouncy_balls_bulk.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5ff3aaec15127.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_601fa30559ce7.pdf
    • https://cdn.sqhk.co/nukunudakiju/icjiggi/draw_car_3d_hack_mod_apk_download.pdf
    • https://cdn.sqhk.co/piwizogir/WievQgf/76055963428.pdf
    • https://cdn-cms.f-static.net/uploads/4485163/normal_5fd9e3c22c688.pdf
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fe0bc76b28fa.pdf
    • https://cdn.sqhk.co/tibakekavero/ihD49h2/91019252698.pdf
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fcc6afa641a1.pdf
    • http://fibotemirazopo.rf.gd/74419972286.pdf
    • http://wapudajikipidem.epizy.com/the_economist_may_2019.pdf
    • https://s3.amazonaws.com/dewazewokib/nomoriwadaguxesuduvelenew.pdf
    • http://bikumomobopo.rf.gd/scapple_app_android.pdf
    • http://budakokubogomax.rf.gd/48351573852.pdf

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