Malicious PDF — malware analysis report

Static analysis result for SHA-256 147cee604c8a39c1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 13:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd8ab9a1cc1325ac968311257d059e45 SHA-1: e16540035cdabe02537c6234d3af76b9319b2446 SHA-256: 147cee604c8a39c113717f931c8da1c85e029e25281520d322435dbb061ebd67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=cool+little+things+to+build+in+minecraft PDF link annotation
    • http://bukharaalpharetta.com/sites/default/files/file/87736812124.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sipor.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/pujuvanajisivalaj.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/18938443767.pdfIn PDF document text
    • https://penzion-palice.cz/content/82401302979.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910191408_df38ib.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/devepuz.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/59796771945.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/44683405499.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/mumexumegov.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/zekezokidija.pdfIn PDF document text
    • https://istanajp.net/contents/files/99298859423.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/salap.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/8615242771.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b410b8e1d---37155360544.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/morex.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361b9f1931a---zosupilarifobekezen.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/pilonoro.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/37915840489.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/8203969407.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/53035043551.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/duwikizoxa.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/84797047724.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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 11196 bytes
SHA-256: fd35d76eaa8fa92823546b88c0c31b224153cfb041ea1508c32228ba9e243b7b
font_02_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 17224 bytes
SHA-256: 18e3b349e5a242856cbd9f1e2c69bd910993686a0bab9faf698207a20717b04f

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