Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cda4bd425e4b124…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 23:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e12694d3cb78552d3e36c8a9dffc3c33 SHA-1: ceb89ecc1df4b0317ad5c6d245360d4f63b7feac SHA-256: 9cda4bd425e4b1248328d38262b089e10d6bb72469d40a8405e6ed7edb0f4caf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting an attempt to obscure malicious destinations or engage in link farming. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e37691b3e4acc173f71ccff8939b9246/mujuzonujilizenad.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/20929208014.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17466612867.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/jajanazigu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/20966529665.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22341931594.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/96845447152.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5b26d58e---80644073546.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/bopesolebupobozisorop.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/wugugur.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/popenofemodazelodalagar.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/lunubilel.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/pabitabifebomepabe.pdfIn PDF document text
    • https://granitnet.hu/editor_up/79483370040.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/gakumagutatunesabimi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/givapupiwexo.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/61151348070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+computer+to+android+tvPDF 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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 16648 bytes
SHA-256: 0f48792277ca6fc9cbba6311917292a3d53856fd071b659f5c1cfce2f346d48f
font_01_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10704 bytes
SHA-256: b67904a379bc64e9497e5bd7c71b951712f4a5f77f292cc556cca16e20dba486
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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