Malicious PDF — malware analysis report

Static analysis result for SHA-256 083b589186d809ab…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 01:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02ad53527fcd266ac582e87b01096a5 SHA-1: 05d93a52da1857acef3fa91091515c18a9b86b7b SHA-256: 083b589186d809ab911b5c81bdb4fa9161b7c7499374b2d9e7a448ff23e20bdb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://knuhpharm.kr/userfiles/file/20210905085301.pdf
    • https://mediaget.ru/userfiles/files/68063847778.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/34413185998.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/132786443561393d6615b93.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/34650416816.pdf
    • https://printsolutions.ro/uploads/wysiwyg/files/kuzodevajojuwa.pdf
    • http://vkts.se/userfiles/file/fuzibi.pdf
    • http://mmsmarin.com/imgimage/file/lilemenoborozapusotixadi.pdf
    • https://aluminiosarla.com/userfiles_arla/files/91663435051.pdf
    • http://abnig.friendship-match.com/upload/files/27024446843.pdf
    • http://erh-hu.com/userfiles/file/27530562346.pdf
    • http://notariocprietoa.com/notaria/documentos/files/lekirugubujiwodezew.pdf
    • http://linza-market.ru/upload/files/jufefijekupuxelemel.pdf
    • https://signatureshreyas.in/userfiles/file/83761343086.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/jawenazimuf.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zubisu.pdf
    • http://baloneacessorios.com/_upload/file///sabikozezazarevenulo.pdf
    • https://ceramicasvillaflor.cl/UserFiles/File/95633117999.pdf
    • http://okzawidow.pl/img/upload/files/39752061841.pdf
    • http://kingtonkatsu.com/uploads/files/zabeferasiratazoxinomuz.pdf
    • http://kiajihlava.cz/UserFiles/File/kinojor.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210901_0D3B0210CC65CC8E.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/91026369827.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/18865079676.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=flow+chart+of+hardware+and+software
    • 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_off0000ddd7.bin
73d86f84857ca1a753bd17121fa1343d18eb8af6e9aee9508a0810f8903fa758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 17352 bytes
font_01_sfnt_off00010aac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16792 bytes
font_02_sfnt_off000122c3.bin
384b851b1963f82662fa8409e533dd6ee56ddf328b21eb25b90031a87178ef93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10544 bytes

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