Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c416634a526f43a…

MALICIOUS

PDF

47.7 KB Created: 2021-09-27 09:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aca3ecfe84d36f08cac22b8f22d0efab SHA-1: b67544e37b03ae1a038936a4ba79371118e55dd9 SHA-256: 5c416634a526f43a7bf526adbe2c7363c7fcda8d83639a531334f370f73be4ff
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to obscure the true destination and distribute malicious links across multiple domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7242

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
  • 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 http://cserepakciok.hu/xdata/file/91605469866.pdf In PDF document text
    • https://huaku3c.tw/uploads/files/202109101923083826.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/78539254584.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/53661336408.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/jiwaxodobowivetulupape.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_013224.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109241319527614.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/vakipeb.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/gufefose.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/47012942168.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/rivaji.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/71643213451.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kilinovupasivinonujogaki.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mafilaluxojuximetebaz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b052bfa40---53940678614.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jesujar.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303190868.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/mumaposofedu.pdfIn PDF document text
    • https://reniuved.it/file/xobanasejajowa.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/babeg.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/4556712324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=time+tree+iosPDF link annotation

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