Malicious PDF — malware analysis report

Static analysis result for SHA-256 4019f89b6acabc93…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 02:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49240af307f76a10c4700d20351ff94b SHA-1: dcc56c2400d02232733587f44b584134b36ad1a5 SHA-256: 4019f89b6acabc93e231a150b48c19bd3bff43f0892a279af7730ecadec22b75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or link-farm domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://konferencii.org/js/ckfinder/userfiles/files/leliru.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1f952229---zuzodukekevosidawato.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6c0b2502---66138878063.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/galulum.pdfIn PDF document text
    • http://eva.am/files/eb093c8660ac035e.pdfIn PDF document text
    • https://phnews.ro/files/file/xofiluj.pdfIn PDF document text
    • http://4bx.pl/public/file/sitozixinopemilurevag.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/450328804.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/xiboxodarotirukera.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/virusesix.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/fotureripazewodod.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6ed41da2565ed7814ed0fdf054ff2a10/vifuvebusat.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/nesipotag.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48967745811.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/55954248909.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/20987934766.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/75588488267.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/3545870684.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/28656128684.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210916_162714_1457.pdfIn PDF document text
    • https://euchebnici.com/img/file/letumawizuvageram.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/37553033511.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/90872595179.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/betuworoxoxujazusalewixed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+record+streaming+videoPDF 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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10716 bytes
SHA-256: fbffa2c748417ec64050c92a7d3881a033caaeb2f7efe4d2b5b633916801f847
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 18236 bytes
SHA-256: e0ec7c93bafb439397727b7cd909fa9de3cf63c0b78f9aa2c14f0e07231bef66
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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