Malicious PDF — malware analysis report

Static analysis result for SHA-256 464081d6a3dca10d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 06:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83f7e95e7cbae4f1952e4a56220a1019 SHA-1: a82a1a471f4d69c1fea53d65e7a034277aab37ca SHA-256: 464081d6a3dca10dae366ace03210405a93adde45795ffa2f5bd22180f2e6916
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ClamAV detection and the heuristic for a 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

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://salman-group.com/userfiles/file/fuvavubelowif.pdf In PDF document text
    • http://cartopack.com/Images/file/99777716139.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/16951772089.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/77575769878.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/gojekevujiruleduzasaf.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/leregisipevin.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/jisilarovofujubemolex.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/51342606100.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/dufesuvobi.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/57119449266.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210911_41BD2D33F1AC182D.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/nimiz.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/jatavugoboluma.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/zurixe.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/femofe.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/jilelomebezut.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/96813436007.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18c0931b0---60595164933.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/fiwor.pdfIn PDF document text
    • http://www.heksan.com.pl/file/mililesobeputavuwavez.pdfIn PDF document text
    • https://svltv.in/userfiles/files/wemododur.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680addda79---31959511988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+music+maker+appPDF 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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 10704 bytes
SHA-256: 6c6e76269bce353615bfce8d6919396ddf4b8d5a80ee10a98dcaac74e23299d2

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