Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2da37d1815c5cf6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee5cca8b65b4aca9a1b5c17acbace98b SHA-1: a645d1b2e89189900929043fb8dd9f9b35c3fb62 SHA-256: c2da37d1815c5cf640b32183984739012e855213c84f38591bb5b6ed33be6352
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0c5de649---xitaxuliladuj.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/xitolesupof.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64979266430.pdfIn PDF document text
    • http://web5gstore.com/Files/files/bejalu.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/55665501141.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffa1a27842---58282879423.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/kasupeke.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/58103584570.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/20763354854.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/84294583217.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/67336404249.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/45886383879.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fuwabedi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/dumabituganageki.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/vetakusoxude.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/92914050498.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/tefisag.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16733842635.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/venonorazagazobu.pdfIn PDF document text
    • https://halkum.rs/files/88768979944.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/romusirafupolovuriku.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/nilojokutetagarov.pdfIn PDF document text
    • http://wych123.com/upload/files/fifadidusapabivovewazezaw.pdfIn PDF document text
    • https://mar3ol.com/Files/files/xoludufajulavobifit.pdfIn PDF document text
    • http://anindecor.pl/files/file/78947993929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=update+youtube+apk+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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 16900 bytes
SHA-256: ce8c945ecd310b95ec00d08cf1b2b3cd6badb5aafc7e564bedec7c99b4b61c0e
font_01_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 10564 bytes
SHA-256: a1a83104f17df3b96eb9ff0a1f5f1d977c74df49eeb8c0258598bbfc7e075392
font_02_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1