Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdfa156165b565d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 09:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8558972d85f3cac84bb2c2e19ce0c49 SHA-1: 83b3a313d302d5fdf8e2720b8705342dac1a2228 SHA-256: 9bdfa156165b565d9b7194a9bfd5045ad5968f1ede6f1b245127b5b8fae82a47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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://tahitotfalu.hu/ckfinder/userfiles/files/waxarogide.pdf In PDF document text
    • http://sunnysolutions.it/uploads/assets/file/29716638817.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/80274995495.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/raposaninogetupogisekubus.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fbbeebdd85a0582808b686f710205302/zekuvujolijogofadizolajuw.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/54306258158.pdfIn PDF document text
    • https://songhongresort.com/img/files/dibofelapuloteli.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/56870346935.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/60010637289.pdfIn PDF document text
    • http://e-district.org/userfiles/file/dolifow.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vexoliwotokaba.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/79248065070.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/87768237860.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613d234487d2a.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/53245432328.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beboti.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xadisozikijujoxidufezolep.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/32265242215.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/tapafirojevajepugovomife.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135810de1f4f---87809635751.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/9535885980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=six+guns+hack+apk+2020+androidPDF 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_off0000c179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 19592 bytes
SHA-256: e121807636da17e9340731f0b42806b85595831db9ecb70a10c2f00bbee15925
font_02_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 11128 bytes
SHA-256: 00c9d96508e39258b0586a3d1862781c7bb81aec2e6846af6289767eb1cf64dd

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