Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e983010193a615…

MALICIOUS

PDF

76.6 KB Created: 2021-10-05 23:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77ea3397cfb7af62c30d508812f16c3e SHA-1: e8808add2c8937825dfd574d09fa8b84d6ef8972 SHA-256: 61e983010193a615f02f56bd62e92b36c5d75e8238a50e02d46ceacc60d04f9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://uralcomservis.ru/crn_fls/crn_files/regidafemomiraxedija.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/lekejizuwujalaxi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/nupifonesukivusujeli.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/tapuku.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/mukitodeg.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/43298577746.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/20912271872.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/39107024561.pdfIn PDF document text
    • https://hirurgija.me/files/xazabobewixado.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/sofagamagomewisinuwiz.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/54404478169.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b253babc3e---rekega.pdfIn PDF document text
    • http://stisk.com/file/vuvopewufexib.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613913f0cc492---surezozubinimawumorov.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xulodijavovog.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/68360403518.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60871472498.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/45509461744.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///83403267861.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/guselexupawefitelijowiba.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/girafelutawutogarudoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dear+lord+my+fatherPDF 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_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 10372 bytes
SHA-256: 2368101644079f1ec1d38225e640dd52b4cbbc89beaebbf87e48ecff5b63d730
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 18716 bytes
SHA-256: 45a7733f5fd6fc039d1ab6fa3de20020ceb494384658e35510be98eef5f0aaf5

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