Malicious PDF — malware analysis report

Static analysis result for SHA-256 6563c3575b42de41…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 01:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c60b4fce6b44c0c3f6a5993182317197 SHA-1: 1741b6b858a964ec7198d992c156743ae14da98c SHA-256: 6563c3575b42de4119e06c0631e4b12ef3145ff02cb890157f6a31092d484579
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing or malware delivery schemes.

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://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/76959848826.pdf In PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/nofupigakenokebutimi.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/xemofuzuviwusejominitor.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/bilemekidelesipufu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/naveburulum.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/50015065152.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96106249211.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/26865120343.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zilusabamud.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/25282074237.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/vanifunutagomavosowewites.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/noxisilaripaga.pdfIn PDF document text
    • http://oodow.cn/upload/file/210916104339925038b4g0i8rwh6oy.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/gaxabinokisexu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091613544216.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gijibu.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/22839705162.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/josuvomi.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/netun.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5006bcac---xanemivoxa.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/tameselijebowupaderog.pdfIn PDF document text
    • https://ntc-container.com/upload/files/70729152087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wavelength+of+visible+light+in+nmPDF 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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 10760 bytes
SHA-256: d99fc1a3dbbca483b89f9bfe7286fea897497464d90f0bea43d6b8d1effa9b7a
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 18944 bytes
SHA-256: 6554c85a777b139a3bb742600ddc8dc651d54fa872464d0f1c08c169ba9a2781

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