Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef6f3fffb0941cc…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 18:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02abf90f9926fa3000c5e6ff225c4a35 SHA-1: 26318cc6dd0ff1f5ae07928a9189ff18b50b91f2 SHA-256: 4ef6f3fffb0941cc5b280c40d34ffacb7dccf2c84424c1f5531a55cfdf4a28e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host numerous links on disposable domains, likely to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://goodtraefarm.com/ckupload/files/20417122923.pdf
    • http://elitsatodorova.com/uploadfiles/file/73756588802.pdf
    • https://kaptenhoki.org/contents/files/70907914205.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161494f31a5766---renuluduxox.pdf
    • https://quangcaowebsite.vn/uploads/files/vifokejiwumog.pdf
    • http://bananamusic.tw/uploads/files/202109031208009265.pdf
    • http://classiccar-jp.com/js/upload/files/kudejawuloj.pdf
    • http://trans-serwis.com/userfiles/file/606673085.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/mumupikesasafawuxe.pdf
    • https://greengenome.in/admin/userfiles/file/demimatitixutujizap.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16145b7a457e62---zidibakefixarobofuniwi.pdf
    • https://ph2020.org/ckfinder/userfiles/files/muzitekuxedajuzogape.pdf
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/sixajaluravapumowis.pdf
    • http://dglytbt.com/upfolder/e/files/20210902024225.pdf
    • http://machin.kr/userData/board/file/55010678787.pdf
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/faloniwetesa.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/wenura.pdf
    • http://www.galiantsolutions.com/emailimages/file/11662468959.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/45041739061.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+battery+vs+android+battery
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 16792 bytes
font_01_sfnt_off0000e67e.bin
3344ff4261119332f08914267a8c087e0cb0a184bfe2e2932397f43dd8fba2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 17856 bytes
font_02_sfnt_off00011409.bin
6cb68ffaaeceee5bfc498cf5cb0e3cded7facd9a41eff538a5f0d7a95be4eccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 10712 bytes

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