Malicious PDF — malware analysis report

Static analysis result for SHA-256 499bac3cda70b677…

MALICIOUS

PDF

40.0 KB Created: 2021-10-09 18:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db794f9757ea77440cbbac45b26bd8e8 SHA-1: cb1cb2f3736d7dc95ca1831526680d99e4c0e57b SHA-256: 499bac3cda70b677c43f46ef418a16a7dbd5c2d52e599a57cd255c2e263654a7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-heavy content, typical of a screenshot hiding a clickable link. The embedded JavaScript likely facilitates the execution of malicious actions, such as downloading a second-stage payload or redirecting the user to a phishing site via the numerous external URIs found within the document. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9455

Heuristics 6

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=embedded+android+porting+extending+and+customizing+pdf PDF link annotation
    • http://i-physiology.ru/upload/vikukatobukepojivesaxupo.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/noxosupijixovogigulexuxu.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/71340328540.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/kegorixejorowuzidu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/88225093543.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/38528439036.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a00fc34a0e---51725683717.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/wuzexukesaxufu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/66586929576.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/47280253194.pdfIn PDF document text
    • http://halaljones.com/uploads/files/69559255543.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pemujevujunareke.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/38268504120.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/bunube.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/roliwuk.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161498016641d3---defulosegoluzizawixuxomu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/tavevi.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/39454572078.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/21121971512.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kutorobagibinijowinadi.pdfIn PDF document text

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