Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821d66a0c972ff4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 02:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5465e0a7ecb1ec48feac66e6d792fd96 SHA-1: b4f02f0c6b5eb14367e9c2638a8f3faca3adef9a SHA-256: 8821d66a0c972ff4aa9ab84c12745b038d42562cdadf6f060dafc088663f0313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically mentioning 'windows 7 iso image file download', suggesting a lure for potentially malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=windows+7+iso+image+file+download+64+bit
    • http://dhleisure.com/ckupload/files/sexisaxakawal.pdf
    • http://ammk.sk/userfiles/file/87529388308.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/wikomaxubupagivuno.pdf
    • http://autodilykanka.cz/cmsimple/images/file/votawar.pdf
    • http://weddingdove.tw/uploads/files/202109170838533463.pdf
    • https://rrr71.ru/upload_picture/lamifolixo.pdf
    • https://agrilaui.com/userfiles/file/71661103589.pdf
    • http://dostrojar.sk/UserFiles/file/xawinogatonosoverajezunuf.pdf
    • https://www.netcorp.hu/data/editorfile/vuzav.pdf
    • http://adice-area.com/pictures/files/36630954065.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d911fa5dfa---nosujafalotisifotufux.pdf
    • http://studionegro.net/userfiles/files/rolinemapapote.pdf
    • http://askaudit.ru/price/47246139592.pdf
    • https://computerzone.pk/file/23393969462.pdf
    • https://ljlconst.com/admin/images/file/49011488096.pdf
    • https://vongtaytramhuong.vn/upload/files/korovowuzubigavumitasigef.pdf
    • http://gowowdeli.com/uploads/files/dolorapopevuseraxez.pdf
    • https://serrechevalier-skifun.com/imagesfile/mewesasapeluximubaxavo.pdf
    • http://antifftech.com/uploadfile/file///2021091723214812.pdf
    • http://massimobertoarchitetto.com/userfiles/files/wozopok.pdf
    • https://artedelvalle.cl/gal/files/file/vovajufifixujixi.pdf
    • http://deaprogettazioni.it/userfiles/files/53669528608.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0a72138e---9184520961.pdf
    • http://atya.eu/files/file/14015914093.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b45a.bin
12dec73581b05646e3fdd7976c519048a17c16bd2a31321ca5069716c2526c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 19320 bytes
font_01_sfnt_off0000e6ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16792 bytes
font_02_sfnt_off0000fec3.bin
92213b6c0d2d8ef50f353df3a688b4fa2c7d852125ad454f012100df613365f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 11112 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.