Malicious PDF — malware analysis report

Static analysis result for SHA-256 279ba303448cc7bf…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 15:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44d7df7a3849210477802c7d2a2bd87e SHA-1: 0e447a1ef849aa29c48a3ab82bd83fabcb1fcef5 SHA-256: 279ba303448cc7bf7418a94568c9077b71306f95b95cc7843f29ce60fe655fb1
126 Risk Score

Malware Insights

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

The PDF 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 distinct, potentially disposable hosts, suggesting a tactic to obscure malicious destinations or distribute malware. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://glassick.com/userfiles/file/funogiri.pdf In PDF document text
    • http://sdsenlex.com/upload/files/zokatesegovadi.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/88038845122.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/rominifim.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pivamobiminuta.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/bagibijamimiwijotijaba.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/sapukipivilagezi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/063698c0008d6d71c8a338eb5f101062/benatukirazidebi.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/42615340934.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/95468466694.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xatoxinexovujipadosesog.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/fudelo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/21059901132.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/58712261233.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fexomipa.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/wifavofoxotozoziwajetawo.pdfIn PDF document text
    • http://wernitznigg.at/files/gipugorisa.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/wixexoru.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/13521704640.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/89611956668.pdfIn PDF document text
    • http://ipceurope.com/assets/file/voresusiruxupuz.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tbqpe5k1juha0dvut31tn39en0/87154544888.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/67415228732.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/gulugevu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/gisonijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+ping+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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10296 bytes
SHA-256: 89d0a02765f4acb6cfc9040875d3aaf7ac7274e7e0cd0c1184f506c3bed186fd
font_02_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 17976 bytes
SHA-256: 13bc09e6231ab8a9f8db0afdd296c210ab1ffa77f07c1de2638cc2e30c98e224