Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e53cce8a5355c75…

MALICIOUS

PDF

51.9 KB Created: 2021-09-10 02:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbf0b45d7e7109c25a9a0e22af6906dc SHA-1: 747e3efa52d8c6a319ea7172806a3344f8af5e48 SHA-256: 7e53cce8a5355c758d8337902e84f4cdb321c923a35825a5861bf4ef33a2efe0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a critical heuristic indicating it's a phishing trojan. The PDF contains numerous links to external PDF files, many hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a social engineering attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4952

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tchid.net/userfiles/file/89038186163.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/87521535481.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bunajaz.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/dumonuxerime.pdfIn PDF document text
    • https://dyaa.club/uploads/file/fedegiluvezed.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/91529567098.pdfIn PDF document text
    • https://dacola.com/upload/files/25510577730.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/7990641972.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kixafusebatilalofusuzi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/21523298921.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///lugeguf.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/sibenesis.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/78947940696.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/11352723087.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/wakeb.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21136476724.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pajaxu.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vedixupodo.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/sabugatuvazaxamufosugefu.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/ruduluxofunesupek.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/60454245587.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/79053309944.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/gupoziponowunokawaxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dale+carnegie+books+free+downloadPDF link annotation