Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b197c5e3d044f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 20:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe23ae2d6d0df141d6c665c9264c11ce SHA-1: 403121d7cd19dbc4998025a8f08cba11bce17f4b SHA-256: b56b197c5e3d044f86772ee3412984d8b4579b210c2e1327bd3c13cc9a838460
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 that appears to be a redirector with a UTM term, suggesting it's part of a phishing or spam campaign. The PDF structure and embedded links point towards an attempt to drive users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=minecraft+hack+mod
    • https://semangkabiji.com/contents/files/18092010731.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/96937074994.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/6283256175.pdf
    • http://klpa.net/userData/board/file/popesa.pdf
    • https://aldurra.ly/images-editeur/img/file/vipoxuj.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/jimenesesemebikab.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/57764071772.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/wejikepumefukuwogaka.pdf
    • https://ustunbilgisayar.com/userfiles/files/80039352734.pdf
    • http://wxmx.cn/upload/ckimg/files/202109081119185214.pdf
    • https://neksav.com/upload/ckfinder/files/nukonimujejipekokene.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a077d41b---kovewumofewi.pdf
    • https://semangkamerah.com/contents/files/worapubokesixas.pdf
    • http://rund.cz/UserFiles/File/konoxavasezuwira.pdf
    • http://putzlappenborner.at/editor_up/69157002446.pdf
    • http://modaxch.com/userfiles/files/dipibamol.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/77476183081.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/papuveta.pdf
    • http://jingyilin.org/uploads/file/zabufosolukijidil.pdf
    • https://egca.fr/userfiles/file/davoboregabodeti.pdf
    • http://www.lovebliss.tw/UserFiles/files/jaselopipuvuvemobojoked.pdf
    • https://upbfassadenbau.com/upload/file/pazuvilovelofavezorerapi.pdf
    • https://jensbrode.de/files/file/39979586128.pdf
    • 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_off0000c2bb.bin
bb25ec92bc12712cce036340710fe2b8e4dbbe8f9453b32f337e2a8345de0748		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 10612 bytes
font_01_sfnt_off0000dacb.bin
4cf56a94bdb4d3a58a68a8ab95b1fd65d35cca66e6f893c7f6e5a4dfac50a888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16864 bytes
font_02_sfnt_off0001069b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes

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