Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ff09c62e2184b4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 19:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a49fc369e02fe57a940e6705ee8b080 SHA-1: 1e07fe8d1c1e7dda22ec4e3b95c889d533c0ee5e SHA-256: 60ff09c62e2184b4e39d8ab3cf95315e7d9882a17b181c881195212be7f969ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kstarsmall.net/userfiles/file///70969927140.pdf In PDF document text
    • http://mingmitrcoffee.com/user_img/files/kimorasawabumezenimunorun.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/gapiwerazojakodapama.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/85526565441.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/12172015988.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/54018611482.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kasakonasiba.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/39137265702.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/zusofiwovobowunelitu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/64087850585.pdfIn PDF document text
    • http://bdsductri.com/upload/files/bumitu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10f190279---42996989156.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xagifurefifadewulako.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rugurakajizawipixane.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/266488357.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/woxufulufizotosamamufu.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/70796402916.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/94013553382.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/lekimewasewitufedip.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sunasevi.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/waxerugare.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/4537369150.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/94351765390.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gosoreferowexofakilerun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=magic+android+appPDF 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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 17304 bytes
SHA-256: 199323bb2a2ce377bc72a286fe0199b13e1bda78bd7e548c70f64f9c05624faa
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 10240 bytes
SHA-256: dce7dc6c6d115ca327dadffa8c63d068a663b667f51bf6a58d552f2bddc64743
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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