Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69a3cfebc72922…

MALICIOUS

PDF

40.7 KB Created: 2021-05-13 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1093db290e81014ae0ac6054486caaec SHA-1: d6dd2bc37243bde70dc2380aa4879acf57a4e15d SHA-256: ef69a3cfebc729228aa3a96aa6ec120275e34fa935db93109f7776453b69d7e5
84 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, including a screenshot disguised as an image with a hidden clickable action. It contains numerous external URIs, with a prominent one being https://xajibur.ru/strik?utm_term=kohler+cv15s+engine+oil, suggesting a redirection to a malicious site. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8679

Heuristics 4

  • 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 40 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://xajibur.ru/strik?utm_term=kohler+cv15s+engine+oil PDF link annotation
    • http://tesugujinarijag.mywebcommunity.org/small_unlock.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffb7b2193989.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/juwigokiwexe.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ihCgjem/70012552855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6027d8236b45a.pdfIn PDF document text
    • http://puwonasomoso.22web.org/2582017495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fe12a787f114.pdfIn PDF document text
    • http://valilep.iblogger.org/10024491910.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/55263120458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5feb7b042e11c.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/iejafjf/wakukeb.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/chaffoteaux_pigma_advance_30.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ahe36he/56361065948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_60365d175fa65.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/tsyjdkc/keyboard_piano_for_beginners_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fce8af99fd59.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/tidoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6039111da38f2.pdfIn PDF document text
    • http://vonuvaxi.epizy.com/consort_diagram_template_ppt.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_5a037b318a6a463d88adb3d87d71fc3b.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_d0938ba4feac498dbe0a21466f0eb65c.pdf?index=trueIn PDF document text
    • http://fatufad.rf.gd/goxefisakulijazesedajem.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_e794b19e84474fa6808f80085e5ec10b.pdf?index=trueIn PDF document text

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