Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a09dbb4a00a3eec…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 21:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8de5787d368a5ee1f2953e9dba47b1d SHA-1: 3e85549b3bc832d57633bc1aa33515a4a3dbddba SHA-256: 8a09dbb4a00a3eec2273cfdd473445624ed906306b63aedb54186497a6b88759
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports its suspicious nature. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pixomot.ru/uplcv?utm_term=i+have+a+lover+full+episode+eng+sub PDF link annotation
    • https://skvacations.com/userfiles/file/selalar.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/75551142818.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/kakimatutaxezogadij.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gamida.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/38217627515.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/87900697967.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/53477001994.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/86777596617.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87466213908.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d8e8e95---14318133475.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/gojonusotojolivufikuboma.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/pilet.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jegutarinubo.pdfIn PDF document text
    • http://ned.ru/uploads/files/24739549465.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16146458ddc5d9---jixilasabazawozagupug.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/lalosapekofe.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/dipolebaxulovurupizanasan.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/90169357477.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/32919867235.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/53317504758.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/66430055910.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/gudigudozojeguwuz.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bipidafodova.pdfIn PDF document text
    • http://davcpundri.com/css/file/39279162104.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 15804 bytes
SHA-256: 530f9ffe3cd3acc6b0ed572aa67c5ba6fae49b0017e37aa129a5a9747828b83a
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10936 bytes
SHA-256: 4df80b2b8b9b558733149ec92686e0b130c4c09903677825204236c5952ad2d4

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