Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9499fa362d9b921…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 13:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c40dbd9fa60ff4019f1a4a4026cdf01 SHA-1: e7a65de697e15be991cf2f278975f9df86708a6f SHA-256: c9499fa362d9b921f8e706229b25f0e944e188a05b52d40573a520cee1a66edf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm heuristic suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leosservices.com/userfiles/file/23031657798.pdf In PDF document text
    • https://femagnet.com/upload/edu/article/file/1413962454.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gujesa.pdfIn PDF document text
    • https://sharenkon.com/files/jimifigazefizovexifotu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/mabirikukolilobij.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/kolokofurazogiwapadozefe.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/52608404041.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/19635536263.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132908536469---20172315077.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/29116559820.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/81196160472.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15762556689.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/57117216148.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/30916007997.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///24981469581.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kiniz.pdfIn PDF document text
    • https://orrizon.ru/images/file/wisejaxi.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/92209602654.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135969f83824---kexurezexoji.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/fagijewixibane.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82222197473.pdfIn PDF document text
    • http://kgmda.com/upload/files/44363680900.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/merado.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/pujejasusoro.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fuvubatadejabedux.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/68002134057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=factory+reset+android+codePDF 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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 10408 bytes
SHA-256: 2ac012284bde08f6db4adb89b805d30f9df602220ab7e0b9557917c172b2f672
font_01_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 17896 bytes
SHA-256: 4a6a1d8d0bf795f4ff32985d0cb6e1e7b25b119d8d25aaa755a8bbd7f199b068