Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf03a4c6802658…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 06:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9d6d11ef93bf0502878bd8130c020c4 SHA-1: f8117bf0e10811f7fe980ae359fe158bb74e6f96 SHA-256: 8ddf03a4c6802658f81a56d4c17eff17159830e071a04e2020cf7e2e97b10267
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, directing users to multiple disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chekeeh.ir/basefile/chekeehir/files/72862115503.pdf In PDF document text
    • http://dongzzang.com/userfiles/file///ketaverim.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/48249393576.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/64249641028.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/74885432678.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/9812330459.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d414415794---23264258395.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/sazaxafiku.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/81041374434.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sosuxaxip.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/61697618126.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e72fa5e8cab00419f7d649a4b64aebce/kofifan.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/30767584376.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pafufujedorewatepanum.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/1761244228.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xalalexorawugokapuwabixux.pdfIn PDF document text
    • http://elpijisystem.com/file/tasovokitatowupizofoteduk.pdfIn PDF document text
    • http://technocom.pl/editor/file/wobazozavepo.pdfIn PDF document text
    • https://2acontractor.it/images/file/49377127492.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xigoginorirop.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210906_110528.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/pezagobojufa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902082605824875.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194145583846.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/mamugifenometoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+convert+email+to+pdf+outlookPDF 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_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 15296 bytes
SHA-256: 4fec197f440e8def34e0eb5acb419ceb057f7beeb881af2499f2c8c204b38ffb
font_02_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10948 bytes
SHA-256: 9f2ebc7131c3070daf0a65af19f56799bf0496273caaaded2d4297c626dfc64c

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