Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b37a06cc5794ed…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 14:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23a4f588d70aef3cb0ede0e484e52811 SHA-1: c819842c35f3f95655fb7632a256910aaa35f0f6 SHA-256: f8b37a06cc5794ed8dc1951176c21cf47f961771ab8b73df4da8775cef2b6d04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URLs pointing to potentially malicious or phishing sites. The PDF's structure and the presence of many external links suggest it is used to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=lol+free+redeem+codes+2020 PDF link annotation
    • https://glaze-metalart.com/upload/files/pabikeba.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/wenaz.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/fizewutusijofuxeletil.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/fijijetatoguf.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/wofugi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/38907091556.pdfIn PDF document text
    • http://protok.pro/upload/files/91303313017.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kasafamerejepowuk.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/83825134000.pdfIn PDF document text
    • http://www.bash.cl/media/file/gerevaxopafifeseg.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/30654635177.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec94edba---95230974737.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/49196697845.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/wapewotubaladawinixazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeae807a2f---39576729590.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/81758588431.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/depalamokifel.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/36160838104.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/96888572537.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19335053857.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/naxux.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/16867958895.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/65820366055.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/3390590078.pdfIn PDF document text
    • http://manu-transport.com/documents/file/89474083852.pdfIn PDF document text
    • 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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 17872 bytes
SHA-256: 541c975f110df26b7bf696ef1845d3f4e49fe208c65928600a217b46b33b0c43
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10380 bytes
SHA-256: b7a99ffe575ea7480959faa78ef2148612c8fc535612df17dcd46ff456a45cc5
font_02_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1