Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa4a77691edfad1…

MALICIOUS

PDF

101.4 KB Created: 2021-09-10 06:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b497554d971d0594c75d2bfa65e6d851 SHA-1: 602b92eeea3bd245c50f07c8e41b3860f7d0691a SHA-256: 2fa4a77691edfad10d35de32d96ed21bac660cf0acf21939c3fdfbfcf9785ee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chayka-svg.ru/files/zuwaxawoturaru.pdf In PDF document text
    • http://gamebonda.com/ckupload/files/8521474301.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/galakuxewetu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/lanidegunulepoburaruviwis.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kagulurubozisal.pdfIn PDF document text
    • http://weingut-suppan.at/files/kidemuwen.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xajazar.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/gopugubabij.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jonapuzejibugif.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908055417.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/lusefubijaripofam.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364b9b54764---varixugasovove.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/75483846965.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wodugosewutomeko.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109031154541200.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/46061913465.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210909022005.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/81789169915.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/kilokigisubejaza.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kisejatukuwuxafud.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/43288003746.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/16648121936.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/gadidovulepameze.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14797135206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=schrodinger+wave+equation+of+hydrogen+atomPDF 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_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 19616 bytes
SHA-256: b7be40ba0c37c9d05a18798e8093bce79e6653c9db6b64e1ba5adf7d21be55db
font_01_sfnt_off0001555c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D73 11296 bytes
SHA-256: 45c9e1037f5d0aadafb6bafc4eabec75ad2683848cd816b5c092ef1ac2493607