Malicious PDF — malware analysis report

Static analysis result for SHA-256 12536ae24b7357a3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 02:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7da447ea115dc3fc4b93a781925585a2 SHA-1: 9a78ba1143386592e5dc2e719694290e646428bd SHA-256: 12536ae24b7357a3caa07f53fa9493368ac47e0f9b7abef5b426cb8c59c3109e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, forming a link farm on disposable hosting. The presence of embedded JS suggests an attempt to execute malicious code or redirect the user to a malicious site, likely for phishing or to download further payloads. The heuristic 'SE_URGENCY_LURE' indicates the document may contain deceptive text to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://meimagedance.tw/ufiles/files/75157147360.pdf In PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/nizalumofakutoxamunafu.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/39870170327.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/21328989824.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/viwar.pdfIn PDF document text
    • http://tiquital.com/documentos/file/momovofenefobus.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210915184523.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/rirul.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/13884092507.pdfIn PDF document text
    • http://onelove.cz/file/dokitadezakalojarepaj.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/panomejegizijaxikoferod.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/vumotikumagelip.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/biboselulaxokogaviti.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/parukopiwerupalamunigene.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f225a24585---45610917456.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pewomaxejepabufobejij.pdfIn PDF document text
    • https://educhina.mn/editor/files/16434958016.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73665217204.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/89184114318.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/jodajudasodet.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/watofuzawitepa.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gisunusigemoxixeguturo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/lipitoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bts+notification+sounds+for+androidPDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 20996 bytes
SHA-256: 411660299d07dcdd6bdf67fabbe91e7a870badd52c12445882731afa7251571b
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10444 bytes
SHA-256: 0bcdc1a5f7f7ee7d9e2c5b1e498fb5e33d604cfd11a890d50f7f44afd2a0f8ac
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1