Malicious PDF — malware analysis report

Static analysis result for SHA-256 27aaa90b523c689b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 13:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1774c984ce47cef6c819701dd80feeb6 SHA-1: 3687607d6df9ee1f37a4c63b57134d7284e200af SHA-256: 27aaa90b523c689b50c84636afb72bb8ec7064e5fe44e6d76b6e59db54628a63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'cructi.ru' with a 'game attack on titan' query, suggesting a lure for potentially malicious content. The PDF structure also indicates it functions as a link farm, directing users to various external PDF files hosted on different domains.

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 https://cructi.ru/uplcv?utm_term=game+attack+on+titan+android+apk PDF link annotation
    • http://salamino.pl/userfiles/file/zuxekowi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd3dab140---rewolagakunez.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/80640994887.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/rogijoxapajagowufojavatov.pdfIn PDF document text
    • http://vititanon.com/user_img/files/41149635052.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/xufaxuzidopofogirobozaj.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/tafuxilasomevabitexun.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/64351161083.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/lajumine.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210922151712.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/40645430095.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/tinus.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496fec08a79---bogodub.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67076484444.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fokakafa.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/xitivobujodedol.pdfIn PDF document text
    • http://fitviewer.com/files/file/mesadavokanedikowowati.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/13782853876.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/fujiparila.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/66492282232.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/nidapogowusezojamafujutew.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xukedodo.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109240209549654.pdfIn PDF document text
    • 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_off0000aebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 10592 bytes
SHA-256: 7d2164a79d4a35631621853fd5838d01353b6442bcca6d68c9a0c5728eb400c5
font_01_sfnt_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 16964 bytes
SHA-256: 498198f024205c9df96bd70c94127e68ecb66176756dec20a87b1b75a8c8da7e

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