Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae23fc14a5b14463…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 20:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f074752f67bf0b8dd7dc666260c6bf0 SHA-1: e46e7a75ed31576e1c459df83ab6f8752d146974 SHA-256: ae23fc14a5b14463201bf619fcd75d45879630bc5b1cb6fe004d1b7e5729e3d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, 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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=impressions+face+swap+videos+android PDF link annotation
    • http://originalbau.hu/imagesfiles/lexeputofekeligoxox.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/tinaxu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/81304cd92728f6fb9248ee5105778c24/13000705263.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bixibokiwafexufomolaki.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/govewafurit.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/60018901047.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/57557495265.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910013817.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/zaxorulukikulokaxagu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vunoriwu.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/likaderef.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/kusivisovenugebu.pdfIn PDF document text
    • http://smirna.pl/files/file/25008461627.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/vitufevowogiwezosa.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/23289114704.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/48997938350.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109031911228565.pdfIn PDF document text
    • http://yjccnc.com/upload/files/kegidalarezanij.pdfIn PDF document text
    • https://hgb.se/filer/file/15213738239.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc491172e---56525773315.pdfIn PDF document text
    • http://totoumi.jp/upload/file/25733010565.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905015631.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rovipusotigope.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/fejufegijerijidi.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dinutiduzexerimo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/44162221943.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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10740 bytes
SHA-256: f98295cdf7644204f41883f23b36ae93738a3b904b9fbda7133b2c03365adfef
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 17800 bytes
SHA-256: 30e93aabd4f635954f6327216e68e70273f76a2d542e5ce1eabcee9dff7dde95