Malicious PDF — malware analysis report

Static analysis result for SHA-256 794e92c10c0b501e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 16:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e8c6ca8d10b458e71133b3d4e5598ee SHA-1: f043ee5c8c3b16015a48fef8e32e7fcdc6ef6f7e SHA-256: 794e92c10c0b501eab69687561f1430b003372ce903d5fb9b39c1d697af456a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of JavaScript and external URIs, with one URL pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=best+android+app+for+camera+effects PDF link annotation
    • https://foundationkuzmanov.com/files/degarom.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/rafodivegopukewikupol.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/93839156936.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lamisozedonirigodi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvowi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/somigavevabusizipaju.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bazufaxufiruvuxen.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109132209388290.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/93492114599.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/18800107215.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135be7ec13ec---4647595944.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109151319137089.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/veruxudakixubekamu.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/79635454644.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcc4bea83---77704648970.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/77811481657.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/18934513715.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/68470288710.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lupogewumel.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/rokojega.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/xusoledogag.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43148319136.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/5981364730.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/1680406361.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/raregojubot.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/puzoxedometokiluludapofu.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nitepexij.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_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 17668 bytes
SHA-256: 4c1cd1cf463777a01751e82b04e6de414e62009af3a731ce515a1f78c9812c53
font_02_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10788 bytes
SHA-256: 630b2ab593c3075526d1b2bde2694d2b53c98d361607237884cde03c481afd32