Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e99c3fbacf6c73…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 19:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d4d6535bb563090846be84a0232e6a1 SHA-1: d5331280e2984fcc698434d629df0fb19d4a4688 SHA-256: 52e99c3fbacf6c7330b93335e8dd382c513a069652d9fdf3f1aaa3e2c42db757
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts with few links per host, characteristic of phishing or malware distribution schemes. No scripts were extracted, but the presence of multiple external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://sunpower.lv/ckfinder/userfiles/files/75131935762.pdf In PDF document text
    • http://www.siposferenc.hu/html/suzebefuzubaduwezow.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kupifir.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/15820936856.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/64674584240.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/vegutopuraxabusamimumesed.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/343002624613a612e8bc31.pdfIn PDF document text
    • http://sartor.ru/upload/files/84790432406.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/bimanijoxezadigo.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31329184323.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614de0597846a---gifesonolubisojikare.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/mezutab.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xedupaketoxosoronizojo.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/35113656193.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/lizidusugoweponerik.pdfIn PDF document text
    • http://mp-journal.com/media/file/koxasigukeva.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/20325434593.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/94511802022.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/18184195007.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/muzaralorepibeganul.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/58189285356.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kofato.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/930f486769caade9d36069e52b201613/gejixazeped.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/gonogejevuweloge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+bluetooth+data+from+one+phone+to+anotherPDF 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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 10820 bytes
SHA-256: b788b78968d58da15c748c8645197167f7403903b5058624beeae9abf62ee1b6
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 19404 bytes
SHA-256: a4004029ff1e3ead1867e9a98b70d591e5b484dd6e2d926d9c7661a9fdf7bef8

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