Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e7661cac5da297…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 13:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4efb2ad6d32486c830080ca2ac1f078 SHA-1: 1780d45ef0d295c679e3a30d191353e714e016ca SHA-256: 53e7661cac5da297293c25abe9d3422236e4f421ea3ea43c9fd9f37d2212de1a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to disposable domains and a link farm pattern suggests a phishing or malware distribution attempt. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/21234225055.pdf In PDF document text
    • http://growlink.biz/userfiles/file/finenesonopufoxesoxu.pdfIn PDF document text
    • http://lamay.de/userfiles/file/naninokusejo.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/4004322535.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/80058755947.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/78852547852.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/84406976269.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/21061751024.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/49192901746.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/53561958698.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/69470865239.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac7c2279a---57025832731.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/mukep.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/4604184419.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/18781782910.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dugeguj.pdfIn PDF document text
    • http://ttc-investco.com/img/files/butefawupazita.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/69136803109.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/sunima.pdfIn PDF document text
    • https://ms01bet.net/contents/files/raviwapope.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zidakutotebemamube.pdfIn PDF document text
    • http://kccmaul.com/files/files/lononatiporo.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vixepokoribegidolesuzitel.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/sofisotizonu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/14802070239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kotlin+dialog+boxPDF 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 18112 bytes
SHA-256: 1694add8385c13b857b10e3326286d16f2ed3a2bf4e8790e2aec5f4412ff75de

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