Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c966de515a6143…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 04:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 889b4603480f55f26c2d62680256fc1d SHA-1: 29cc59cbd2886f949da3d937c8621f916f7f35c8 SHA-256: 73c966de515a61438d898a057a4a539b9e14d93f61c161f986150657468b04df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with many pointing to unknown or potentially malicious 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 PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.gamylai.vn/uploads/files/21479000013.pdf In PDF document text
    • https://aiaciran.org/cache/fck_files/file/poxukekovijunikaj.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • https://dacola.com/upload/files/taxiloziz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nanibi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lupinibovulumavusulax.pdfIn PDF document text
    • http://generoussecurity.com/uploads/fumilo.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lubusoseraxosubuvavuniz.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/vulegabot.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e949688d8e---22576462488.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kadaxixegetinemogefiwet.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae06645497---lowoj.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/39190690041.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/zebekajemewopose.pdfIn PDF document text
    • http://apart1day.ru/file/vodosaviwun.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/fuzadegatofaloxon.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/76870235031.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/26575334193.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/womijiratu.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/xaridafiberu.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/78000012013.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210908222322972113546w6.pdfIn PDF document text
    • https://tcremich.lu/files/files/xiribup.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/38580235107.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nusatiwowunipadodifonuduz.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sepadexesudavakazupota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+kies+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_off0000b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 14516 bytes
SHA-256: c8a24057f7c1f47f391c34273f217a5f8bb1701c189c4de5b7a6d6ed3d83be0b
font_01_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 10304 bytes
SHA-256: 3f1fd71e4adc592e853197cb79361e7b3b0fd57047097657fd4c188e4d1fe92b
font_02_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1