Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08728bcf2f4adf…

MALICIOUS

PDF

76.9 KB Created: 2021-10-04 15:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d66ecaaa2f09e45e08f18476f2e33de SHA-1: ca60e94e53eb8d260c92e2ee571a5bcdfe77a0c1 SHA-256: 8a08728bcf2f4adfa6cbe1126a4ec24a603d28763d0918c2e485fb6ddb136bb2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5364

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://vuason.vn/upload/files/kegusinapinefoz.pdf In PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/gitefagotixep.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/davifapavefewo.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/21607866155.pdfIn PDF document text
    • http://szpk.hu/_user/file/29179714587.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/xudugipupa.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/19540102411.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/85643065300.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109091024102512.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/referalojikejakajov.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/93129841206.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/giwalok.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wuwatudolilajafunerav.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xemugawenufataxodotarikol.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/xiligiraw.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zevuvusidega.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210917153807.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cfdc71f4ce3f891567c1b61873a1c9bd/dopen.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/tonanipaliti.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/98879887821.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/vobigi.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_E27F2B196DE4FB89.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/91877363555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=crucial+conversations+ebook+free+downloadPDF link annotation
    • 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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 10984 bytes
SHA-256: 2b9d200a12a500cab9bd291b77941de45e086e5e4655878ee21c9ab1e48b4e23
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 19068 bytes
SHA-256: 19ab4467180510785c1ce5a9764685e3d0d749b40a6fa6f60943102b4775f07a
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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