Malicious PDF — malware analysis report

Static analysis result for SHA-256 441be8448612afc3…

MALICIOUS

PDF

65.1 KB Created: 2021-09-08 23:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd25859d5f6c897dee32d3b3f15eb81b SHA-1: 7a73a67878d5117cf8ca3dd7f90e0759c964509b SHA-256: 441be8448612afc3b55e3a334a57e497c4e179ff914fe1cfc4e9f855362d1b79
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://winkeleninzundert.nl/uploadimages/files/tudetipebudo.pdf In PDF document text
    • http://cisseo.net/userfiles/files/87736125699.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/54973516044.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/rakamuzavigakejome.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gogilituwigedem.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161385198b1c99---buwutupefegutozisabe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065219d097---52014995352.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_124342.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/48783823218.pdfIn PDF document text
    • http://slsnn.ru/content/file/bujonifit.pdfIn PDF document text
    • https://digireg.se/upload/33177580748.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/48227578702.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/14510406363.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/93651026137.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68158778933.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/98713070555.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/zekipo.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/60981832053.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/16058503645.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/6537483365.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/7294970045.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/1265300122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mp3+to+srt+converter+free+downloadPDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 17512 bytes
SHA-256: 5df00f24678531ebbaa85d28d0d367e02126467f70e967b332059b6f66b423d6

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