Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b9050035201274…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 11:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9f5374c4415332f64f49224254474ca9 SHA-1: 975060dea3eb39a2766de3fe334ac763d5a4eeab SHA-256: 65b9050035201274bcc07d7f34bf33237ada5a62e6919248a828609f7eff033d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. The presence of numerous external URIs, many pointing to disposable domains and identified as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 http://karimeh.com/public/userfiles/file/13110442168.pdf In PDF document text
    • http://tottazo.com/userfiles/file/kuwanufaberaf.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/78619535039.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vukuvatepokojuxixowi.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/tokuvoziwadeta.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/63094834542.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/wurolulitigaxima.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/41241235243.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210922053335.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146a953ef3a2---66387617631.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/fibutaxip.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/61657859482.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/41694877144.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/63887366139.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/lodagabum.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/73837271197.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/fojusopefifijedepuwore.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/58781045411.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/tabukitiputok.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/51389960858.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021092221452073499.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/jonagake.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/19663609415.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/85301505781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=windows+2012+r2+active+directory+installation+step+by+stepPDF link annotation
    • 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_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 11200 bytes
SHA-256: 08ea3bb704b8efbcebb7c101e72d0a3a30684bdc7bb99af4571a35a654fa1bf3
font_01_sfnt_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 15700 bytes
SHA-256: 6107b381bf06a5dee2f2cf33905189e79a474bb4b915ee863dc1fbfd03df1bd4
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1