Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d60dcda6469a20…

MALICIOUS

PDF

68.8 KB Created: 2021-09-12 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35620be7e49edce8359131f0f107c7d1 SHA-1: 04202546d58cff8c63b3244fc6921f02bb4c6c2e SHA-256: 65d60dcda6469a201df89a0d5c17edd214b5775e964a798ed0def050abfee8ae
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of external links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zlataraburmevuckovic.com/files/86020348361.pdf In PDF document text
    • http://knipia.com/userfiles/file/kuxarapidu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71275e36b---29641148056.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/48290516557.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/42653038058.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29988617775.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/33699541408.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xesofewefa.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/dekuv.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/52590600932.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/ripav.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/zoton.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/putajinul.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/fuxuwi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4spjvdn1igrchl18d8keu02mee/wawuzekawexan.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/dovusezifoxosovad.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///63843879237.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/wigoxabazoxonojasevuza.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/55813727070.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/48089046552.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/fokipumuxe.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pegaveviminakodazafevit.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/ditakupefodinazira.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/40546042459.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/2653627327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cast+chrome+to+tv+androidPDF 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_off0000afff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 14968 bytes
SHA-256: 62ede69e94608f433ba676ed87f19450cf719bb8f6c3baad9f18bad33831e36f
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10688 bytes
SHA-256: 31bf69e75adbc2bcf5903d4d6bc0ad72f91b052a8af6b226a85856c8af9b1aa8