Malicious PDF — malware analysis report

Static analysis result for SHA-256 9481c70d19aabad2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 20:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a609c81f897654184d544f3444d4733 SHA-1: a0a36a9efeea24eb5eb5426a09125fa53adb63be SHA-256: 9481c70d19aabad224f4e915e26f1c7ce89ff196967b8bdbf69e45c74b9ba71f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nirmalujjwal.com/public/ckfinder/userfiles/files/98653192364.pdf In PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/varerimexisivusa.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d157e8bbc9d000ad267ab1f46ff0a773/24210300369.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/gusenukireru.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/nirev.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/49243089978.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/kujerajajuvaxati.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepejigikil.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/joxemitev.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/15816482495.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/70768025928.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/94455000824.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/92983604621.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fonovezesunamoxigef.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wisupanenizux.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/64855002991.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/nonekewogatewijizurojemeg.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/59423115091.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisosis.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/78903544132.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/81193091384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+deleted+audio+from+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 17676 bytes
SHA-256: dff946346e1c88f8c54473b61f93fe381759f3633834a11214f2b08346470689
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10952 bytes
SHA-256: 02126262ea925508b2876c433525b1967c59877689fe9b8ca0570f2afa2a7e1b