Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3025c67ab7b7521…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 04:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21127d6a65cfcd8bfa93e323d3d092a5 SHA-1: 20f362adc5f53b00837fe8ed8c335057b96f2258 SHA-256: c3025c67ab7b7521d725f0468fcc594cb5c28b5f371051aa8a9ad4712d81e25b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to disposable 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 malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://enewind.com/pliki/file/dugumubutejeko.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/26333057649.pdf
    • http://universalestetic.com/userfiles/file/76957296702.pdf
    • http://eca.or.th/ckfinder/userfiles/files/21159676842.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/96281156925.pdf
    • http://lycee-elm.org/userfiles/file/kurafunul.pdf
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/65603892099.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/8830999892.pdf
    • https://cambodiadriverservice.com/userfiles/file/jugimarigewidan.pdf
    • https://ags-car.com/upload/files/82148635005.pdf
    • http://ijfbn.com/editor_up/90480478293.pdf
    • http://ideal-site.ru/userfiles/file/rozibejosukadumatoba.pdf
    • https://kocarbon.vn/luutru/files/27497659320.pdf
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/pafegudagawanewir.pdf
    • https://svingenieria.cl/userfiles/file/45173871246.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/07a33246ca335455b76a6f06d5ee92b8/vugogegakaza.pdf
    • http://trust-law-firm.com/userfiles/file/20210907091249_94564800.pdf
    • http://dnt-mayak.ru/content/File/sixepubekadusaj.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/28407618457.pdf
    • http://theexplorerthai.com/userfiles/files/nogeni.pdf
    • http://master-vin.ru/files/file/28435513593.pdf
    • https://go2germany.ru/files/file/gefujokudigemegafub.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/58611943860.pdf
    • https://lemonsport.sk/upload/file/82155180463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+android+apps+for+wallpapers
    • 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_off0000f02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
font_01_sfnt_off00010844.bin
bd7b16cdfcce5e4a93df85604acabf39f6231cc21c58b59b1b534fdc4cdd5dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10632 bytes
font_02_sfnt_off000120ca.bin
3fc7f1fd5531e2a66a082c98e9e398c6298ab615848d65f3188fc8fe148b60db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 17948 bytes

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