Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b47b0e2b9932b5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3d98e2f19afd1f0d200661fa3f1af7c SHA-1: 4afebef77849d8a725abfde7f7b93733b81e0604 SHA-256: 91b47b0e2b9932b54c5e69f998c0ef52d302cf602db00cc83b96e1fa7ee2f4b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of many external URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=amazing+grace+violin+sheet PDF link annotation
    • http://fnathservices.com/upload/file/rizugodowo.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/sekon.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/pifuxiv.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/22900372196.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/31329131316.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905203113.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a2a5p8lq8fileieki0hei7u675/54016707032.pdfIn PDF document text
    • https://defi128.com/userfiles/files/74165581414.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/21894660226.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/96548280968.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bijivuvuruzavagor.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/39013788308.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/30150450131.pdfIn PDF document text
    • https://desco.scp.hr/files/2556618262.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/febazipafe.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/vadabafiturumip.pdfIn PDF document text
    • http://lawngo.net/fckfiles/fetupabogimukizeniri.pdfIn PDF document text
    • http://mrybalko.ru/files/90917793927.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/norelulipitologejuledupa.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/70956110797.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/27317203479.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613028455d029---nagoved.pdfIn PDF document text
    • http://ledins.lv/cms/file/zavakofodepojugojawan.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199159184452.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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 10784 bytes
SHA-256: 5d98e53a40aaa643d69354474981828881aaf16ddbb44fc4a82be986f292b58b
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 18068 bytes
SHA-256: 538d8ccf90ea57d9de314c7d0d97bc7385ab6d6256f567c595027b1298ce0851

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