Malicious PDF — malware analysis report

Static analysis result for SHA-256 727e5d83b01322a9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-09 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a22ad0ef41d405aee6b5a7bcde8f4c3b SHA-1: 69676662f1546eace91d6f144fb7fea94af39cda SHA-256: 727e5d83b01322a91f810b6d2e94536fc13aa9087e1d3e1a8e7621b7b28f70eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it is used to redirect users to potentially harmful sites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161353441612a9---29929520033.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/31033987656.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/35117098090.pdf
    • https://esterkins.de/ckfinder/userfiles/files/xiwevuxodubujex.pdf
    • http://slhospital.com/upload/fckeditor/file/21877964390.pdf
    • http://autobedrijvenindex.nl/images/uploads/movatutiv.pdf
    • http://katela.net/userData/board/file/zofuxowepanaf.pdf
    • http://kammatrans.com/userfiles/files/defutobonefeminujodaf.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/fubumorefosir.pdf
    • http://gazosilikatnn.ru/uploads/files/nozazogojusojobipasaku.pdf
    • http://bresky.cz/res/file/29783282985.pdf
    • http://budaors.varosom.hu/userfiles/files/dipanufuxo.pdf
    • https://euchebnici.com/img/file/78719099327.pdf
    • https://vilus.cz/userfiles/file/20619536095.pdf
    • https://gkia.org/kingkong/userfiles/files/99313091077.pdf
    • https://cortemadera.com/wysiwygfiles/file/92557397428.pdf
    • http://pk.mo/userfiles/file/76382818321.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kubexipabu.pdf
    • http://flairpens.ru/uploads/files/55049262278.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8a7d1df997b87ceb06a174ea4d80436f/21198267556.pdf
    • https://zahidnawaz.com/UploadedImages/image/29511662350.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jevamigobodafupigese.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+i+use+my+phone+as+a+ps4+controller
    • 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_off0000af77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 16792 bytes
font_01_sfnt_off0000c789.bin
fd6c8e296ceeff897a4dbe942be5ca2d3359c90fda950207552ba7f334383fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 16392 bytes
font_02_sfnt_off0000f0bb.bin
f2437d3317ebf0af207722fae02f2cb68582dd5e523d7459f1910ac94c76a129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10960 bytes

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