Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b02fc2ecb41f679…

MALICIOUS

PDF

55.4 KB Created: 2021-09-24 18:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93296d5a903e7e76f0d9f994adc9e2a1 SHA-1: 40f1f09ebf6f788bbc5c67ec5d6a88c94db6a2e1 SHA-256: 3b02fc2ecb41f679a8b4c06df266fb95e870db11912e9b822f2a55130d66165b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

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://irlanc.ru/uplcv?utm_term=lange+basic+and+clinical+pharmacology+pdf PDF link annotation
    • http://hutbephottaihaiphong24h.com/upload/files/xudexixazovite.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/fanefilawokevuk.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/17545720126.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/paposikelajoletev.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/61962549562.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/41052843862.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/zewexanijo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23d1f0b53---kosewo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/fobet.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccfa721e10---gubaganimo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/36456487382.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/vovinorezupamudibaz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60cde5aea---barozezodiresijesamisem.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/parukopiwerupalamunigene.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/kojipijok.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/votukef.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/45138784952.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/62757574456.pdfIn PDF document text
    • http://canoeing.by/pics/files/23132471247.pdfIn PDF document text
    • http://afslab.asia/upload/files/27059895600.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/8805334624.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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