Malicious PDF — malware analysis report

Static analysis result for SHA-256 b008da529814512a…

MALICIOUS

PDF

62.6 KB Created: 2021-09-16 07:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1285e3cdb533857b9f440f568601c0fe SHA-1: ce6006588fdadd9426526150030fc36a7a140725 SHA-256: b008da529814512acc0df776c42bdbee3430855d08c2abd47491e58325491e07
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on potentially disposable domains. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8315

Heuristics 4

  • 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
  • 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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdhaaiegcqjr09pvvtnts7fa84/36829113925.pdf In PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/wivapupavusapidifazoxok.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090315020935.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/29340626222.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jekus.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/katinori.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/padasibop.pdfIn PDF document text
    • https://mackbeks.com/files/file/63412249867.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/kumofagid.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/risawijusu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/74819184709.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/35072200514.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lotagevudanijokalurixure.pdfIn PDF document text
    • https://aedwea.com/upload/foto/najomivewar.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/deneligew.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/suvoresibefinubag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e369bbf---jigof.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/69215056642.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tijitisovijefazalenipokef.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/62149744110.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/75126078650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=borrar+cuentas+de+google+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10700 bytes
SHA-256: 116d3afee0efee082f3356869ef7a9295deec2a7d705ae850edd4b58992b3496

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