Malicious PDF — malware analysis report

Static analysis result for SHA-256 de431b9a0b9f6478…

MALICIOUS

PDF

49.1 KB Created: 2021-09-21 21:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 95d4b0583ca81071a1008a19c6b34731 SHA-1: c654e64b8a1597d4c2690cc689dad8633d803038 SHA-256: de431b9a0b9f64782271092fdf359f6b6fda9ed688529288cb1836949aae495f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to evade detection by distributing links across many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7192

Heuristics 4

  • 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.
  • 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://teranor.com/ckfinder/userfiles/files/wobowumebaviseli.pdf In PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/wigemanavew.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/40493550668.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d970195c7---puwepupokerefiduje.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/59274821405.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/74089799141.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/30754050017.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/zodibidupitewewalezut.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bawobisidofoxas.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/31676038322.pdfIn PDF document text
    • https://tckontrola.hr/files/liropunamonumawu.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/32631443925.pdfIn PDF document text
    • https://ratoempat.com/contents/files/texubelilesus.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zufedubuludisa.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64237566362.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/40214705981.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kuboserebijaluzipezatuzu.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/28266766155.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b119e58d40---tuxanimukexigarapapi.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vasoledizow.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/banaxineruruvoxivaj.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/23146716336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=praying+emoji+androidPDF link annotation