Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f55b8185cd87e…

MALICIOUS

PDF

109.2 KB Created: 2021-09-08 19:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aa8aff564cf7ffd7baab1f329fe166c SHA-1: 89f94d072ee13b8bd9b9dd298c21c07df8548795 SHA-256: 572f55b8185cd87e0a5eb602b4a299bad3b3dc2f43c3df039a4469137058a309
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and contains numerous embedded URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts with few links per host, suggesting an attempt to obscure malicious activity. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.2353

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://geodavidepini.it/userfiles/files/55049561784.pdf In PDF document text
    • http://geoman.cz/data/file/jezepofutifunetezela.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/45752065977.pdfIn PDF document text
    • http://poorclarescork.ie/images/14485887688.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a4ae7759---sajogujobizobef.pdfIn PDF document text
    • http://bienbao.net/uploads/files/69016672830.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/30776615355.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/kobigusezonutixupejuzu.pdfIn PDF document text
    • https://dalba.net/other_files/File/92644949436.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/36278686383.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/nidupuwuxamemipokob.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/54283794173.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/72286354374.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/kusupemalonitedov.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/89370215795.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/4177230426.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/gisoxorene.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/60014502869.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/18276175984.pdfIn PDF document text
    • https://cityface.cz/res/file/farug.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/fiwarunafefalux.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/dajuxunotusopuvebelizoru.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lukelizogufubawulotel.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/rudexinizanuketamizuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=partituras+f%C3%A1ceis+para+piano+a+4+m%C3%A3os+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAA 11360 bytes
SHA-256: 7221b0471d7e6377993990d23dca5882718cf0776960ccc0e2e09672a11a5a0d
font_01_sfnt_off0001859d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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