Malicious PDF — malware analysis report

Static analysis result for SHA-256 452ada16ca7bca3f…

MALICIOUS

PDF

88.4 KB Created: 2021-10-06 14:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebbfaf342afeb2962bf3f645d43c5ad6 SHA-1: 5941119843854aae87f409a48967a472db6e445a SHA-256: 452ada16ca7bca3fe69a07e887dd7c2ded5f2cc095cb541686e334e7b0823ed9
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. It also features a large number of external URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=excellence+punta+cana+dominican+republic PDF link annotation
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tawamadarozetelaged.pdfIn PDF document text
    • https://12tiga.com/contents/files/98368259096.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/lamixozoza.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/noberakawuwagozewexa.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/denikewebogutofisukone.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78238756460.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/26887196869.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/surenimilulubasix.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6711d0e9---nivelutija.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/nekejilurefokizafoloze.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1987590344.pdfIn PDF document text
    • https://kokomanis.com/contents/files/6302292258.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20211005_160156.pdfIn PDF document text
    • https://brakos.it/file/siwazazasopimir.pdfIn PDF document text
    • http://lex.tj/img/file/43771467803.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/35807231272.pdfIn PDF document text
    • http://muszempilla.com/files/file/38938666862.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/lezupuledijarodoxiniza.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/savapubogipezibevoj.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82612055404.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/38387536864.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/56063596508.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/tafonirijajabesiv.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/20273262225.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_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 19848 bytes
SHA-256: ae40c99c5b969b7df526cc63a873a0d8f3975053c43d4bdc7a4ffb3010903021
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 10832 bytes
SHA-256: 764e109dbca554dd424f560d96d102cd22d01c6297741ebb6b5d8a71b34b4b17