Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c3b8d3d3532d26…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 23:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e0ba147c00c5d793fa6409349e32aee SHA-1: cbaa98dfcb0ce760b06406fbcf838705f72ebdef SHA-256: 60c3b8d3d3532d260e17700ee9f732691645bf4eddb7ce77899b82e461d80a8c
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with a high concentration of links on distinct, disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation and redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://agenziaimmobiliarecannavo.eu/userfiles/files/76276459275.pdf In PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/kupekodarevovajugotobos.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/jesurexowekimivep.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902023740.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/jetuja.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/besoruwix.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55382f30---tijux.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/39203759067.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/84391606622.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/56464989471.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/kajekaxezule.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/bukisurasifefafamofiza.pdfIn PDF document text
    • https://manenshop.com/upload/files/39041566772.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/retesizoxamomexatupida.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/18606921904.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/tedisuriwuvapuxesozobusob.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/mipodigobulevotugudoga.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xopelubozado.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/63004366822.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/koxijinenojale.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/gapukuvetixevolojezasuf.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/xisigegarevoposupogirala.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/tufamutezix.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/70447888853.pdfIn PDF document text
    • http://inica.org/files/file///jemiwumijilowibi.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/begoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=infinite+design+full+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 10484 bytes
SHA-256: 098b6acd6465cbaef9f7fd1470812f6d2a8e28db2a95a32660dd6743cdf2d334
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 17696 bytes
SHA-256: bd64578fa8d861404c8b01252abfa9d04a195805c858201a40c646951ce876a7
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1