Malicious PDF — malware analysis report

Static analysis result for SHA-256 a863a2e0fe7df324…

MALICIOUS

PDF

67.8 KB Created: 2021-10-15 04:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79ad9ef28526d737b07931cbe689e69e SHA-1: 580d42748135b6500ef870ec5b95fdf62bf9cdef SHA-256: a863a2e0fe7df3244d1ccd68b906a71dfaada3850649232e8b9005e851bc3b63
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/zunapubiketawafipu.pdf In PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/tiwivuku.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/batokukig.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/27199383279.pdfIn PDF document text
    • http://aven.su/userfiles/file/2924199099.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/zofipimuwetepuv.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/17762586096.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tukokudag.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/67958893015.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/napuwuverizogexajat.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/viwafularafofi.pdfIn PDF document text
    • http://steinemann-ag.ru/puvotenij.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/gasaxorimigajuxo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/dixuke.pdfIn PDF document text
    • http://xinyuemu.net/assets/202110/files/20211002174858972682.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3go8p0sjm9spgr45c2hvvqasj9/52791186355.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/60960779442.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/mesuzol.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/virokera.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/vezotipuvedopukujomuli.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/39061665881.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/wopekakelod.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/xobev.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=sap+tcodes+for+fico+pdfPDF 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 17360 bytes
SHA-256: 998a6d59b5e984beee4d727a0e24311294f476e92481f9d761c6e6085bfbe616

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