Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd83ccd9d948825a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 11:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed479d9370361cff48fe1454ed9d8303 SHA-1: 75d75afda73ac732db28e5a74bbea280eadfe85e SHA-256: dd83ccd9d948825ab0f1ede684a5e7aa7de9656f4cf8d1952e37548852d86711
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=gif+maker+video+to+gif+gif+editor+apk PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8ad8864b---66893516896.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/sukefenobux.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971413587233.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/68930740763.pdfIn PDF document text
    • http://reopen911.info/media/file/1100521730.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sopekugerudarodufabe.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/kilezuxerof.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56318759180.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/99295162188.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/14721357267.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/65170588375.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/muxuniboka.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/78105989775.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/bolumonozofut.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/54199355344.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/mujavesupupagugepivig.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/92295930046.pdfIn PDF document text
    • https://medius.sk/userfiles/file/nodonedexuj.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/67911938046.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/labukojewitofasake.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/tonuwenesuxopop.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614254e78dc18---waxodif.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/71265583708.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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 20420 bytes
SHA-256: 836ed6332862e21a63e0884743c58fe077acdaffae6decd610fbc734295db7fa
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10720 bytes
SHA-256: 3496827c8082acfc256864aae8eff1dc2fc29e6bf589db09d2bccc09017ee219

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