Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1c4c25bf14be4b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 14:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0257f80f76b8df8afab5fbbd350287c SHA-1: 2bdb3692d17ccc7b835e3586d82c6e49ef626858 SHA-256: 0f1c4c25bf14be4bbd865f4dc18ebe664f5c8af5449f7b84644e645a4786ce42
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 associated with link farms and disposable hosting. 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 0.9947

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 http://www.cerel.eu/images/wyswig_images/file/jemudaxe.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/zuzexoranu.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/942936489.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/lavifeveriwezemukevug.pdfIn PDF document text
    • http://jainfarms.com/uploads/73307156164.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/wimalinetugoperipilufimu.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gigijugi.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/32388357378.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ami6qq1sc74op8qgkvggsdr973/7553917416.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gekifitufefosasoginufovi.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bikosokipifikugukaleviwu.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/49924833138.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/43550826284.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/goderifa.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c69319b8---82211160127.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/5766340708.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/76670664156.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudodobesonetovibilixuz.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zovefewemimo.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/49174089064.pdfIn PDF document text
    • http://slovoveri.org/userfiles/fojopumavixabegokidibuzub.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/72758062644.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kosomisisili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+windows+program%C4%B1+%C3%A7al%C4%B1%C5%9Ft%C4%B1rmaPDF 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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 11156 bytes
SHA-256: 2297193aa4319dc482f9e1f550be7964bc7d829931904d96bc9da7624d1ccc4b
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 18628 bytes
SHA-256: 0723a0f99132c3230acde37c8322bb77e16b7768681d0d38ec700440a600f466