Malicious PDF — malware analysis report

Static analysis result for SHA-256 2028957f4a8605d0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 05:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02fa849098d0e9d74ac4a140f1f3e8ae SHA-1: 38c0fa532c7f4e77e87faee00a7ac0a6d1a104a1 SHA-256: 2028957f4a8605d03f3ef2ee7ab00a755992b8349ca4756d46c888196b3f1844
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

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://dycmc.com/DATA/upload/files/202109180402464903.pdf In PDF document text
    • http://arhive.np-sp.ru/img/file/wozaxerabomuvorufuxivama.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/12643227267.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/2983516881.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/gimukawuleta.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/balobajufaseb.pdfIn PDF document text
    • http://rs-entp.com/upload/file/36773660898.pdfIn PDF document text
    • http://vhz.cz/user-files/solomimejapulokewolopazif.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/24929348816.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/91385731441.pdfIn PDF document text
    • http://geose.ru/userfiles/file/98348259830.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/zusuruto.pdfIn PDF document text
    • http://idcla.net/upload/files/90079892518.pdfIn PDF document text
    • http://pactolous.hu/upload/file/4029162594.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/14311892522.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/26761193080.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mozeliwewufidonufatob.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tajiv.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/63807812621.pdfIn PDF document text
    • http://dsraxys.com/uploads/walubifeje.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/85996090806.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/bafewitozexizu.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/5120820353.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/denixesegujokonawuj.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/13923556625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fluent+ui+web+componentsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17396 bytes
SHA-256: bf96c9ee159c1b925f583361d0b63f7e08ca1c110f8230a1c43d3b943c8d338a

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