Malicious PDF — malware analysis report

Static analysis result for SHA-256 acac491c44c2a9ac…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 14:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62413ba8ea2d317aa64cb9995318a9cc SHA-1: 8599e95e79a3697ce2211a4374b3f1c33e119b68 SHA-256: acac491c44c2a9ac753481ef05b1ba6cfc648c1b171778037fb7b4beea07d677
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 are hosted on disposable domains and appear to be part of a link farm. 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 0.9949

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://cructi.ru/uplcv?utm_term=kannada+kgf+full+movie
    • http://zssadkowice.pl/pliki/54121820260.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/momafageru.pdf
    • http://detikakdeti.ru/img/file/xuluputarutawon.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/peniradufof.pdf
    • http://thankschicken.com/uploads/files/20146771102.pdf
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/86073264958.pdf
    • https://jetaime-shop.dvsportbg.com/files/fuzeremakoxa.pdf
    • http://dolphinkorea.com/files/files/20767388304.pdf
    • http://classicalgardenfountains.com/uplds/file/40379733485.pdf
    • http://salespate.com/userfiles/file/nuvufalipasaxo.pdf
    • https://defi128.phpascal.com/userfiles/files/waxopaledajakazepobipe.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tp1vbo28t0e624616ilggmo42/tefifuwa.pdf
    • http://baoveantam.info/upload/files/38680189898.pdf
    • http://kxzyjy.com/CKEdit/upload/files/91212548025.pdf
    • https://szabobuszberles.hu/files/files/68032965855.pdf
    • https://secolink.sk/userfiles/file/96581663131.pdf
    • http://wildpflanzen-planung.de/file/lojumakedeki.pdf
    • https://etevent.itweald.com/uploads/files/6133949e2dffd.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/30254306273.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b58d17df3814bbff9f4752653d1d45e/tutur.pdf
    • http://fygl.net/uploads/file/181522063902.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/1422720556.pdf
    • http://www.pratikchoudhury.com/fckimages/file/fipojunowerikosenezuguk.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/45548152673.pdf
    • http://epicridesnepal.com/files/pepusuxifenagimivexi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04a.bin
b9b13ea696ab30572f04b273c71ac52da7973fd11873e53a635aac2c7a33ee34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 17548 bytes
font_01_sfnt_off0000fe18.bin
194ee61e171d7b794d1c0b87e613d3558f947ea43f67aa9795a57f4ccf182e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10580 bytes
font_02_sfnt_off000115ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16792 bytes

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