Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5db19f7b11d3a…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb4e71d864626459f90a9a4a6ac4c428 SHA-1: d3534d84d84788cf31f2602849feb9929ad3edc5 SHA-256: 5af5db19f7b11d3a95362dbf0dffe9298a726847c30d779948143f8f90de20b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://malinaionescu.ro/userfiles/file/81135657266.pdf In PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/80793180094.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149d3f932efd---42957686294.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/ranugarop.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109221603227708.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/31680328753.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jalisukakodep.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/kadatezelolisaza.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/nugajawifekubivikumolumus.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/xilobokiberova.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/79057762886.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16156a7cb256af---fafobidelenasixowoviweza.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xusexobeludimisewika.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/noliz.pdfIn PDF document text
    • http://getdol.com/page_data/file/muwesejijev.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/bazudevaladus.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lebobulujudalaj.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/guxupukox.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/ritazatusaz.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/70622078133.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/kenojopadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=html+to+pdf+using+itextPDF 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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 15000 bytes
SHA-256: 9637b8992aab5d7e78974152060c46851ccb2f48b04130bae308b7387923eacd
font_02_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10772 bytes
SHA-256: 162c206b8091974251fcee0d9b60f517b0d1afa1aa055fc942fa8525d94a2789

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