Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fbb04ac7193fcc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 07:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b3de324e1597c4ac5bbf7935e9b9af5 SHA-1: 6a91e799d0be5133fe84a913d1f5d3a7e485ae01 SHA-256: 52fbb04ac7193fcc8d0fcb81f265cd09d12e41bcd610d33aa1825a98a28f3d24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gallerylingard.com/uploads/file/20961452040.pdf In PDF document text
    • http://teplo76.ru/uploads/file/92373450427.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1527919878.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lujinafitapo.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/63123813859.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/luredigaberud.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/65103877913.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/3082637901.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613101aec06b3---bagopalumiluligadijava.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jiwubonosigakatagin.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/bovit.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/27813954343.pdfIn PDF document text
    • https://digireg.com/upload/90743427841.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/90726131045.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/061402449684.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/63720076894.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/gulovafupetaje.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/89708500594.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/84488287586.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89224623912.pdfIn PDF document text
    • https://cartolmania.it/file/sikubanogarivavozasaf.pdfIn PDF document text
    • https://tepihtrava.rs/files/69617558239.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nopug.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gisudatibobulikifosine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+grinch+streaming+vfPDF 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_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 19104 bytes
SHA-256: 03d6588c72126cd803c34f9e91b3e081343419dfc6260c67f783746b8772e372
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 10648 bytes
SHA-256: 489f88b8282772753c3150f5a1869f3000a355982d04d7c8cc9b3cc0640e0beb

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