Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5d1cb936b1742e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 23:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9245146d0964cb317051cf03850aa1d5 SHA-1: 25c695fb13148b410a124eee81f719b6e32235d9 SHA-256: 5c5d1cb936b1742e270accc062eac020486d6cff15253d4d7da0cea88fd7d7fd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, hosting numerous external URIs on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links pointing to distinct, potentially disposable hosts, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs further supports this, likely directing users to sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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 https://allytemp.ru/uplcv?utm_term=clear+storage+space+on+phone PDF link annotation
    • http://dentalcenterstudio.it/userfiles/files/52119158681.pdfIn PDF document text
    • https://manenshop.com/upload/files/53130600363.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/rurowutagoka.pdfIn PDF document text
    • http://gaudi.tw/upload/file/4180876993.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/26263991858.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/32280363693.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/jadigewogexonewexerasegup.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fowonamarutefaranep.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/69987700545.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/pazoru.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d1ef24d---gidinagiwub.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/luxapumurakuf.pdfIn PDF document text
    • http://jfe.hk/userfiles/42573520487.pdfIn PDF document text
    • http://rsst77.ru/upload/files/80304466174.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d738990ef---nalazinese.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904235908129.pdfIn PDF document text
    • http://sdds.be/userfiles/file/51753950548.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/sikujolatezatagakofe.pdfIn PDF document text
    • https://termofriz.rs/files/titewumafugorasun.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/74474836835.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/kilatifuli.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/79820771194.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/73931818034.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/labenibonag.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10592 bytes
SHA-256: 1665d4c0cbc1ee3becd9ac4c8fa68e07c6df22b8234e277ff5bfea542e7640be

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