Malicious PDF — malware analysis report

Static analysis result for SHA-256 25222697ad781dc4…

MALICIOUS

PDF

70.7 KB Created: 2021-10-12 00:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cdc93852a4d7fb2e56e4cd3c03b42ae1 SHA-1: 30875c661bb63b75cd6f5f73dcc79317475145f8 SHA-256: 25222697ad781dc47cf8e692814c6449e3072aaa2d32789972f7fa022b2b1f5c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm, likely intended to obscure the true destination. The embedded JavaScript is the primary mechanism for executing malicious actions, such as redirecting to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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://portofcrotone.com/dati/upload/file/xakozudi.pdf In PDF document text
    • https://ajansnigde.com/resimler/files/9829769680.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/30788346279.pdfIn PDF document text
    • http://citranco.com/users/files/dutupalapubir.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/gezafolubonomutafizir.pdfIn PDF document text
    • http://abc-tel.ru/data/File/96976243664.pdfIn PDF document text
    • http://hk-keber.de/images/file/wotikeforor.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/72951442310.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/nuwilato.pdfIn PDF document text
    • http://hotechike.com/files/files/duzolosetewu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/61214349185.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/71558395372.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/52990798576.pdfIn PDF document text
    • http://test-immo.com/file/22985676570.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e636aa8c3b---8593803158.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/54895485107.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/93678546725.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/musedageba.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/51791757946.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161402fad481f5---bemuziwireleginalaruvobo.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/wubirafidivipar.pdfIn PDF document text
    • http://ingore.cn/upload/files/lazuweke.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/86141822687.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/32338453583.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/pilubunivitopodisitebafon.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=meaning+of+concentratedPDF 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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 10432 bytes
SHA-256: 65aa446a25b05e6d564de87fd9d40fbcf50c16aadabe3e13b7bac8f8af527fb6
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 18700 bytes
SHA-256: 1c5cd68eebfb60ce308976fe7444dff4049361d2beebaa3d07750e453a9861a5

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