Malicious PDF — malware analysis report

Static analysis result for SHA-256 6921ef3ded4788ac…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 14:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a77d3092ccac5012abf09137d23b2259 SHA-1: 584b1f41ee6d04775588939ff09dee2124a94729 SHA-256: 6921ef3ded4788ac162304d7665ee57929da05d7518608aa81680665ca4fc1b9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, and heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

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://headrepublic.pl/images/files/64284425052.pdf In PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kuselamoxafojedolividanin.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/gujosoxafemedaju.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/junilexude.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vikoxuvevas.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jozanobeke.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/mozudibaz.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/5082338229.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunodatok.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c108d02f8---tejigejurosojowi.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210903230100_cmx7fv.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/limuk.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/58534424740.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/jofusemunimilobitojalo.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/20265862209.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/sebefulajepukovopolatoxen.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/96113328266.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/vuguzefezuzuki.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/64296681609.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/67060720570.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/zajajufepad.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/13033563776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=no+escape+streaming+2020PDF link annotation
    • 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 17472 bytes
SHA-256: 8baa47bb923707d407d53b86476693fa15ce1f186b56228f4f1ae92b2d2ef64f

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