Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747482b2e1df9b2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 21:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0fa17e0875192c49b1a2201c3745300d SHA-1: 1d41d417de4a02402f3f7ebf6f934589fc0c6dc4 SHA-256: 8747482b2e1df9b2195e1c8552b54d7cb21aaf3bd0b4553bcabf02ce5cabf269
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=redmi+note+4+best+custom+rom PDF link annotation
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/2554652575.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/43090204760.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/67485296509.pdfIn PDF document text
    • https://shidoremicrosys.com/media/9505340146.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/29308109632.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/gejatibet.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/64403114281.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/56624418567.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/96755743727.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/94241ca8c22665d6cf8df899e66501d4/wajejuvosuvo.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/milipemad.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/11987749928.pdfIn PDF document text
    • http://sieuthibds.net/images/files/zeduzumaganun.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/damakobobux.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/lelekebevomamekaned.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8da87ff8d---48961549429.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/vikowemefulavufimigelitik.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/wekulikekokugef.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/dosoloboduvejekopox.pdfIn PDF document text
    • http://szjg.hu/images/file/gupupi.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/nedatapeno.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210901175235.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31504028656.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/20146771102.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/95164044750.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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 17412 bytes
SHA-256: c3219cf1abf35a4402cc640cccaa0b08fb382429df8928d0af4ab8c519f13abd
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 10688 bytes
SHA-256: 875027f1edfc512fa4127d2528801447aa8d24b09c9d0004eafcd1073b5a0341

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