Malicious PDF — malware analysis report

Static analysis result for SHA-256 48af309d5278a39b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 22:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd77d0b5e1e937306e3bae07dc6adf89 SHA-1: c92170441fd83fe9d9b7299774d813d8c9779962 SHA-256: 48af309d5278a39be3c7eacad90e6c3bd7df3bb0957ced46d80e31838d299930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations or engage in link farming. The presence of multiple unknown URLs further supports the likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://wx-test.com/upload/ckimg/files/202109021217589149.pdf In PDF document text
    • http://szigmetal.hu/editor_up/74933419797.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zosevimojesixase.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/zifabuvowoxopuwobesogore.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwabodur.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/34089679307.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/dibevo.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20666896627.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/5778070010.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/2696528660.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/59860320240.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109021335214737.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/papogurekewokuzaw.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/venowomavekuduka.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jetubup.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/xajuwomeviriwurudifunejik.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/laselab.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0073872ba---8368064301.pdfIn PDF document text
    • http://abc-tel.ru/data/File/68163797543.pdfIn PDF document text
    • http://topp.pl/_topp/file/96109454117.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/50825707287.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/wufedefoxowixi.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/95843189445.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xutova.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5tv2g7kiceeiquu19iotabhv30/94441819583.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/41980017351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mobile9+theme+androidPDF 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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 10648 bytes
SHA-256: bcd91c530692a1d0e7f66b9d3ed676eab633bf6fc33e63a1267a088b034e339c
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 17476 bytes
SHA-256: 7f41ba7ffc116cc3aef9007cc5e33894b6cd19d4a9c29a8bcb72bdb9949b33e5
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1