Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ba358e4c4b38b5…

MALICIOUS

PDF

75.5 KB Created: 2021-10-07 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c261f360030cceba0607b1befd963dbf SHA-1: 652cd70e951f046dda493efeec437e16cb2671d2 SHA-256: 01ba358e4c4b38b5429a9b11bbacc7755c57fc99731b43b8bbe0cc945849117a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites hosting more PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

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://inwebjor.ru/uplcv?utm_term=knuckles+sonic+movie PDF link annotation
    • http://xutricolor.com/uploadfile/files/jewekosetuxu.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/16183321343.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/45725416107.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/52333637472.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210921015439.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/90368618408.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/43401142078.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ccca0c6124863a81d4c80a0a26397d71/14843021272.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/zegizaranu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/41396112061.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/47646398269.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90ebe8f63---wutivelezudajomusidora.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/sadarosoka.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/bogovodoxarususimisusuzu.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gotiziririwumax.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/setukow.pdfIn PDF document text
    • https://alariel.be/userfiles/file/1611509318.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/48962936496.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/22899866248.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tebixumazapovelovigaje.pdfIn PDF document text
    • https://12shio1.com/contents/files/40421068539.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/36044049100.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/87575231867.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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 10280 bytes
SHA-256: a1595874eb206479c82bb92a4bff61216f0e55b4e9132075096e33796c805677
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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