Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d3320ec8b20969…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 08:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ecd67000b1ea2fd32f9db654a12fe33d SHA-1: 46b81718683df921e0505061de418a9d9bc02340 SHA-256: 36d3320ec8b2096995b2665f0170120d00625d5f4e8beaeb1e8d7c1e8866871a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and multiple external URIs, with one specifically identified as a link farm on disposable hosting. The presence of JavaScript and the nature of the URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7257

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sooryavanshi+full+movie+online+123 PDF link annotation
    • https://refakatci.net/userfiles/file/53670794759.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/bobulasepov.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/mudetelum.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/41155471696.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mavasolomodo.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/pasaxa.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rozeduseninanar.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/89313812013.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96929005633.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/fefatuwilipel.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/rizuwopejonesegulugugakix.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/jasagixuravokotuvu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/62201097413.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/keraw.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/bemakelafumo.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/3077739050.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/71182932593.pdfIn PDF document text
    • https://digireg.org/upload/37434747329.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/nerenaxomurarub.pdfIn PDF document text
    • https://lapdonline.org/file/fopefunuriw.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_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 20120 bytes
SHA-256: 97e487f4a3eebc3f3a601cc81fbd1ff2a1d2bc392092c1c544f850f38296a992

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