Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edd04b0ebc8b70b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 13:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d7ceb37050b2d600183aa022bdadccd SHA-1: 291c9edc9dd54056d3d68493f5ad696bff311afe SHA-256: 1edd04b0ebc8b70b3634e2fc3c57e14193d16b01707b2339645af01b2473ed31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

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://el-master.ru/userfiles/file/22686440757.pdf In PDF document text
    • http://iccjsc.vn/images/uploads/files/83141102589.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/dulosaxiwubete.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/petenimikutabeduposop.pdfIn PDF document text
    • http://simoncaulkin.com/images/zapav.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/gesizagos.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/78457573950.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/polefu.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/wanepadatekifod.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jibisowonipapamezikan.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/xuvopemopubumiwib.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/98844538769.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/retorilid.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/rixubovew.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_28B5DF707E3CFF10.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/39668189277.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/82097099750.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dalaxoxa.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/96303366571.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/naxikudotojasukarinifa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d08b4754---25416695134.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130a41ea3764---meribeled.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/tupegatuferewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+3+trending+gamesPDF 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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 17000 bytes
SHA-256: 0716aeab3f575d46a17525adb451477df7a3377a03a30463d1b7b3856fa41400
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 10824 bytes
SHA-256: cb800e2572a26922e939aae80f46e4f9a9c0e11f2443c56c35837a026dfc0fc6

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