Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65dcf3ca91cc983…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 03:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ae6deb9237d1b71519ccada9ca1236a SHA-1: 3cd4c2d0027421570d8acfefb19eeb636e1b9ae9 SHA-256: b65dcf3ca91cc98383ab3276d957453c3454cb47250c12ec4c6251d3a7bdfeab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dirivotamisodabi.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/tutigunugipusifolok.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/86841146272.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493cfa3591---40825803829.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/62413710757.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/bofufopabugarep.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/27600431451.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/joliribugamexutod.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/32417031507.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uproesk0qfrm2bmkhq8rqk3cr1/jomituzewa.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/bufirisivu.pdfIn PDF document text
    • https://elemonbg.com/Files/File/10604277866.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/89502512814.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/28627300843.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/29737785089.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/21403754166.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/tefakepip.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xedivubi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16928104165.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/naxapezasovixutoroxo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/69175311450.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/mubuzuxidetutixipun.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/56587418356.pdfIn PDF document text
    • http://nature-revive.org/files/file/luvujarugaze.pdfIn PDF document text
    • http://yanartextil.com/firma/files/54500000484.pdfIn PDF document text
    • https://intersat.lv/files/file/57514839063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=marathi+e+novels+free+downloadPDF 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 21892 bytes
SHA-256: 0232f87e841b6e6620ab8d421fb791801ce64d994070b03806ffbcafb53b6d7b
font_02_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 10596 bytes
SHA-256: 7f8e74897266d4d5cae6a9d2cf7a015a36dc7b1899e1f5d74d5dc76c9591131c