Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9433ae24691d49…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 11:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c89392bf5e76fe080be17cff5c5b413c SHA-1: b5b56cd043ccb8d7bee3ceb36b416b9c4e77cdc2 SHA-256: 8c9433ae24691d49a14c9758455e3b5f42be68739e4afe0752c4385789de5fca
174 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple URLs, indicating it is designed to exploit vulnerabilities or trick the user. The 'Remote-support tool lure' heuristic strongly suggests the document's purpose is to convince the user to install or run remote access software. The embedded JavaScript likely facilitates the execution of malicious actions or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://florerialafloresta.com/ckfinder/userfiles/files/revokoparuragupugodutu.pdf In PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/moxuzagizokuwojobupat.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/67512339629.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/bojipozoge.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/82286821002.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee50d1d76---81866032358.pdfIn PDF document text
    • https://laser123.com/geektic/files/5893196243.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zulutuwenuji.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/86220077546.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/jozidok.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/86003653392.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o76if5g8iis4cjvjfaljqmcddv/dobijukiwirijudulad.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/wajin.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/79024998207.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/41842090504.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/silimu.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rekorotugovume.pdfIn PDF document text
    • http://mobilenmr.com/files/files/remefawale.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/wimogudebatije.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tiwubow.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/vanadozebibesazusekotuv.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/82000346787.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jodaxaku.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/woliwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=install+android+device+monitorPDF link annotation
    • 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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 18120 bytes
SHA-256: 592ae123e11f4ad7f44e6d47753ceb090d6c8ae5aa5f63c277ee7621b7ea2c6b
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10548 bytes
SHA-256: 89bd70f1a29d3c29ae84313bf01e0a64ae96d428f9d46c2e1518d93cf8fbc12c
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1