Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a2ffa2535a92c…

MALICIOUS

PDF

38.7 KB Created: 2021-09-12 20:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a005dabdd45fe3c4ab85a09779f47a83 SHA-1: e54010dc9a8cb3a28cf30f307cd6d3a84db7bef8 SHA-256: 7a9a2ffa2535a92c288ec33f8d71158afcfb3894b147de0993e6a9afe42f9cba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing lure. It contains numerous links to external URLs, with one particularly suspicious link pointing to 'http://studiomedicoveterinariobellucci.eu/userfiles/files/sonuzanonekarase.pdf'. The document's structure, being image-heavy with minimal text and a small file size, further supports its use as a deceptive phishing document designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 38 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://philabc.ru/uplcv?utm_term=net+domino+para+android PDF link annotation
    • https://ibliberia.com/ckfinder/userfiles/files/dugukav.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/38607678492.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/fugipafuwi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vesigizeta.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vojajofetesivagomagawipu.pdfIn PDF document text
    • http://mosjob.ru/images/file/fazaxixadulev.pdfIn PDF document text
    • http://ud2-140.com/files/49875792416.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97198825191.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/62576833601.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/84948638846.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60c30e6a9---xuxozibevujimenuduzesogoz.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/46077998030.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sonuzanonekarase.pdfIn PDF document text
    • https://www.peeryhotelIn PDF document text

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