Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ab0b7b5911bbc5…

MALICIOUS

PDF

53.8 KB Created: 2021-09-12 01:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d91fd74a20a021f80df44b439b301a22 SHA-1: 78687f6cbd25dac8f8325bc33a2b878efcadcc36 SHA-256: 58ab0b7b5911bbc5ea196d07049f5b74a9d3b5e3fbcd81f67ba185d430c19d42
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on a variety of domains, many of which are flagged as disposable or part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. The heuristic PDF_RANDOM_URL_LINK specifically points to a generated URL, suggesting an automated or obfuscated distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5080

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
  • 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.
  • 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://veiligheidssloten.nl/ckfinder/userfiles/files/4907720413.pdf In PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/nufez.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090301130473499.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202108312121239101.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/minosivufivofus.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/besej.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qtuu5knumau1q1f567g4jjsm0/34348303404.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_152004.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/12987798054.pdfIn PDF document text
    • http://baove24h.org/upload/files/40560933384.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/79561295102.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/maratazijopalaj.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/loweluzawujadobovimaw.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/rulolekubalodenaxa.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/kevuwasogobakurudizufim.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/10508255873.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizikudipubovodorovut.pdfIn PDF document text
    • http://movediary.com/userfiles/file/juzerurojuduvowu.pdfIn PDF document text
    • https://olterus.org/contents/files/tozudumejevakogozo.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/49051675770.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/88264372807.pdfIn PDF document text
    • https://susta.vn/userfiles/file/39361617220.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xabafufun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=justice+league+snyder+cut+yts+downloadPDF link annotation

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