Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65adc52e30abbea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 00:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c17e2d1cbe7a98c6eeb4690a58b0107 SHA-1: fe6cd6013c971d3385a4728a2227b6ab988c899f SHA-256: a65adc52e30abbea49783896d445608606708f9a88cdb2736d89eea262b1c1a8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URLs, many of which are part of a link farm on disposable hosting, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely serves to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 https://medvor.ru/uplcv?utm_term=copy+contacts+from+android+to+ios PDF link annotation
    • http://ave-france.com/pics/files/dudifukivenelefozizozit.pdfIn PDF document text
    • http://nscenter.cn/upload/files/26362914048.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/siluvo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/89052550746.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/97609050670.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/73181406395.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/musewojijowazowofunazir.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/kuxazezagazarob.pdfIn PDF document text
    • http://rococosofa.com/files/files/92880164372.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/31752329299.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/2633950951.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/23977295807.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/jopawizakiwevibax.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bonaludogivase.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/12312432116.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/28464362123.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d4de918---fusejapalixejeda.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109200350578118.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zowozixujivetasovisok.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/59327445310.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/pofititakal.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/bavewarepigix.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/37593740659.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/tofosutifupipita.pdfIn PDF document text
    • 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 10748 bytes
SHA-256: dcfee265168a5027f8fb464c55144aa1ca920fb3486e39f008890ab0dda43873
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 18256 bytes
SHA-256: fe63c88727962ed437987cd1425a1e3567bfe0eaf93276a7b6c68701c759daed

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