Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d15dea51c5512…

MALICIOUS

PDF

96.2 KB Created: 2021-09-19 10:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2adc9729cdd7f4b99fb8bad7a7222ed5 SHA-1: 30ce4e91a74ba49eba4181abfeb209765dafb7dd SHA-256: cc4d15dea51c5512556bc45b7759494da44fa0913c1f8ce788fbf3d6cf56f133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML classifier score strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristics point towards a common PDF-based lure technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://malbreil.com/userfiles/file/34614860467.pdf In PDF document text
    • http://lianbang123.com/uploads/files/202109041724264454.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/dibuwat.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/wodovifutulixuxobu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/60293520565.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/xetezujep.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/7797694492.pdfIn PDF document text
    • http://lactopad.com/uploads/files/23445158831.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911080325.pdfIn PDF document text
    • http://test-immo.com/file/sivejuzegufumiwovumusamo.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/53457382029.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/26364344711.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/44489690367.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140f54c51214---puxubabaxulok.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906175002549141.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/puburenugiduru.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kodoniker.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/16318168168.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/24980339736.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/bofalufeviwuv.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/28423647524.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufupagefefonupurux.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/kazajafojudira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+pokemon+go+2020PDF 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_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 20992 bytes
SHA-256: 47c1447b21347bef3d4d159c7200c5f62e86e357bf9dff365428999fd00238a5
font_02_sfnt_off00015ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD6 10656 bytes
SHA-256: 8bc376cab229ae5a74fe7e99d877df47e44deaaa70f13bb0cfb16b1636745f75

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