Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c954e492586a78…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 07:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ff5f3fe19f31a6789b6463e697785de SHA-1: e121208deac7b9befcecf861891e2c4fa56ced66 SHA-256: d5c954e492586a78890eb1580ef7d65063c459ab8958742ece2983a775e177a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest the PDF is part of a link farm designed to redirect users to other malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://renknh.com/ckupload/files/vezakawapusegonumeropidis.pdf In PDF document text
    • http://osayit.com/images/file/99378417433.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fulosodulubaropinipaw.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/babejuvobizo.pdfIn PDF document text
    • https://foulardfotografando.it/file/sojofelekev.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4098adc7---tapuxabijuwojozaj.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/77854622909.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/vanoxewowoxo.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78814927845.pdfIn PDF document text
    • https://kapefashion.com/files/files/95106070382.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/91318456591.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/befukesobawoduzij.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/xoluz.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/tusiduxijurawazu.pdfIn PDF document text
    • http://heizler.hu/files/file/sakekubomifotigumuzod.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/99194440950.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139810dc5e32---54216314179.pdfIn PDF document text
    • http://identik.hu/editor_up/tekanow.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ledudos.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/nepubaj.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/30088707337.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109060750113195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+a+linearized+pdfPDF 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_off0000bafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFC 23136 bytes
SHA-256: b45ef0ac6a6d46163a7bc0788e57ac5e44d44d14d134a1c650be2a5ee7a97498
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10528 bytes
SHA-256: 9a6334a44d38277122fbebda7b0b48a2c3ba086495e255b3de28d9fc96275ebe
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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