Malicious PDF — malware analysis report

Static analysis result for SHA-256 5447e9df8fd7a8ac…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 22:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 87c4dbc441afe6680b5773a553a6a109 SHA-1: 1f0a2f879aee29a1f1aae9f195ada42e9ced699e SHA-256: 5447e9df8fd7a8ac0f9fa16b1f8d0826348b159c0d7d3582480539884e7eda6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://sarkar.ie/userfiles/file/39646293517.pdf In PDF document text
    • http://autoscuolemontagna.it/userfiles/files/varaxiwaxozekona.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/78325688548.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/67276287727.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917095606333602x09m2i.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/xideruvizike.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/47006243489.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/tuzumubozerorufogivugo.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210919_1B6D7E9C544B572C.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/ximosokavominujir.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142272705124---52918157728.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/55368919302.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64422767984.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/milejabufazijero.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/lokavisakanebogoj.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/11800739739.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qkob4qikmlgspjtkq69iggp4a8/jabufafozuveridex.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/bebuvovumifutonulezasofil.pdfIn PDF document text
    • http://rayanchem.com/d/files/rirenadajo.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/16311958217.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80672413924.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mopeletera.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/1093531789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=percy+jackson+camp+half+blood+confidential+pdfPDF 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_off0000b839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB839 16688 bytes
SHA-256: f82f3edd81139e7327e5564b59d7b00c12e76844dccaa07d6731ee652c8235ca
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11364 bytes
SHA-256: 7351ac0f0cc929fc720822510ce84eaca19ae352cdcbdc379596659f7ed94e2b

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