Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bb47ddf737ff59…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 20:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4271d70832b339914b99b4973a4c4046 SHA-1: 4bb6b6cbb82e67a9abcd2912a78006de040dc710 SHA-256: c7bb47ddf737ff5994800f25ad23783f531bcbf726c7df7144ca5e20ee5961b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a redirector with a 'utm_term' parameter, suggesting a phishing or spam campaign. The PDF structure itself is also noted as a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pixomot.ru/uplcv?utm_term=vlad+and+niki+12+locks+game PDF link annotation
    • http://kawana.tech/userfiles/file/66834097909.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/kenovuduwesirijef.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/62138593448.pdfIn PDF document text
    • http://com123.vn/uploads/file/rirekezewuturubopozunazig.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/pixikutozanuzijilifidabu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/20009654822.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109121820026291.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/86150107757.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/47906970758.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/68983701507.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613991a03878c---72025991870.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gatuv.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tufisenubasirenuzuled.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bekefaz.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/63510540609.pdfIn PDF document text
    • http://rjt1.org/upload/files/wefujoko.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/65315295446.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wuxudadopenepajanuzoxe.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14648690396.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/teferisusakijomerawepiki.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/54823957937.pdfIn PDF document text
    • https://congchung7.vn/upload/file/nilitulazizepe.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/51655748433.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/nalesazeburapulo.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/siwadidezitonixezarulimo.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 10748 bytes
SHA-256: 0588946dfcd411a6e1c144f21f9980ef7300917f3ff05da73b101700afafa4dd
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 19784 bytes
SHA-256: 6580eac290285b096a3509b9b3c98b225a569062cc96ce2fa3d18fa7361ea76f