Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a3259c60bc6c67…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 12:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cec94ccd548d84dfadb320749468e14d SHA-1: 96616983f2697d478548a15a5ce7c0faa10b5d1b SHA-256: b5a3259c60bc6c67e5c82fac742ddcd9a7db35a808c9391263a9e232d25312d8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV detection and ML classification also flag this file as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially malicious content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6323

Heuristics 4

  • 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
  • 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://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3402438014.pdf In PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/xowowivoper.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/14485216263.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pumemawotitinidaxexupob.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/wodogojufipesepofa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/11315193608.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/81998507218.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kodafirarerofexubugobuzo.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/vavejatur.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/sedotidorosisugugelax.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lazuwodutaburujexejutu.pdfIn PDF document text
    • http://compsult.net/userfiles/file/sexufatipal.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ec80a79a8675fc6fd2bc133e4c4044cb/winirasivopu.pdfIn PDF document text
    • https://actorconseil.com/files/file/remisosolakig.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/73269988078.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xebamorivozere.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/fagokupixuru.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/81373702641.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/sakuvemitavemexetenonok.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/tapenamavovinolanunov.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/21062098810.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/walomokugajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rema+namakula+songsPDF link annotation
    • 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_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 10396 bytes
SHA-256: 146831db253527643b315f871721ad2451f6640ed2c5f6f41d7e0e409bfdb91e
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 17860 bytes
SHA-256: 560a017bba2e77d9b4637e0dc551f719aeba7239ba90a3f859c44a4bec50a9bc

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