Malicious PDF — malware analysis report

Static analysis result for SHA-256 5103c3c8205916e8…

MALICIOUS

PDF

37.1 KB Created: 2021-09-15 10:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 253034fbe04b748363d1532cea63c7ef SHA-1: 930cfdb95d8c5a4cc58b9f3bc353f3cb7a672643 SHA-256: 5103c3c8205916e8e4f9ff7b826ef2b01dce0dd3751c8c84590b90b88d7cf2f5
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' specifically indicates that the document likely contains a screenshot designed to trick users into interacting with an attacker-controlled URL, such as the one found at https://smidgel.ru/uplcv. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a campaign involving link farms and disposable hosting to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6667

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 37 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://smidgel.ru/uplcv?utm_term=live+football+tv+streaming+apk+download PDF link annotation
    • https://adverto.ee/userfiles/file/44234327932.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/merokasomed.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387abde24ef---berunaxetadivilezot.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xalotirure.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-13/20210913131854830875.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zebaganeperasoma.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tifavowenupagaputu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/28498928091.pdfIn PDF document text

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