Malicious PDF — malware analysis report

Static analysis result for SHA-256 def73d89ad60042a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 22:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a74ca94037aaa1dcbfc251d510b3acf4 SHA-1: 59b95d8c65cfef96232671d4a9acb7a0706405d8 SHA-256: def73d89ad60042a14771fd8ba674a97d720e68a11d90bb40e2a9f8c5c7b62fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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
  • 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://kerekesvillszer.hu/UserFiles/file/lisoketemomukudonix.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/54979065451.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/murubaxagefarovibalodarig.pdf
    • http://pozitron-s.ru/userfiles/file/gexufexodujeb.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/lipuxo.pdf
    • http://aeon-dev.com/uploads/files/202109010708256201.pdf
    • http://pillshop.ru/uimg/files/48216812906.pdf
    • http://goang-hann.com/uploads/files/202109120601098761.pdf
    • http://trongtinpc.com/luutru/files/86853081045.pdf
    • https://windfreeklima.com/upload/ckfinder/files/21035465774.pdf
    • https://mangonebike.com/uploads/file/52025569285.pdf
    • http://tzsunup.com/upload/wadapojavaxewefitis.pdf
    • https://turkihale.com/userfiles/file/
    • https://a2designbg.com/userfiles/file/fuwazewefapo.pdf
    • http://eventologia.com/userfiles/files/58947512861.pdf
    • http://jawarakreasi.com/file/nodokovakugegupuvoxuwo.pdf
    • http://cc-loges.com/uploads/file/84627119646.pdf
    • http://sitarofindiamd.com/userfiles/file/13919316430.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/3796931897.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/lonixokefixapufukajid.pdf
    • http://totoquynhhuong.com/upload/files/98167899762.pdf
    • http://bptramptour.pl/files/file/falegar.pdf
    • http://belly.bpv.su/content/files/files/69196783847.pdf
    • http://e-baze.lv/images/site/file/boxibadazusobakegedew.pdf
    • https://fsreloading.com/userfiles/files/nawemidinenamuterumaji.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64142216476.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=oreo+tv+for+windows
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
font_01_sfnt_off0000efbf.bin
91d249e6fe69f5df46f103d4091d5c73dbdedbb1e15ada551f0ad156918f2a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 10316 bytes
font_02_sfnt_off00010733.bin
a71ba33695873a89f27b412f077e0c790011cbd64fdff270daaf3e764e2a3149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 18104 bytes

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