Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a5ca75e02bd36f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-24 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cab12f894f8f639c61aba1e53d41adf4 SHA-1: 7a5a1fa839bc512f57d476c0449450d03062bc1b SHA-256: 73a5ca75e02bd36f4d6f292b66789d43a1dda3b511c113340a193ddfb5b6f3f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=hollywood+web+series+download+sites PDF link annotation
    • http://z-i-f.ru/userfiles/file/21457737411.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d231f5a6ae---41561539174.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nopado.pdfIn PDF document text
    • https://masukpt2.com/contents/files/14027505285.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/lonit.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/25330404001.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/biviv.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/lipurizufunewidik.pdfIn PDF document text
    • http://glassick.com/userfiles/file/powodakoluxewixaruzojenox.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/bakexaziwonusedemodoz.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/85496134543.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/31429121588.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/21501285136.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/74346421029.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b3a52fc44009d0512a53e24373c126ab/potejig.pdfIn PDF document text
    • https://bak.vn/upload/files/sonisa.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/20178896093.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/26168587179.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/7544527326.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/favisunuba.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67737423511.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/60569814822.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/30266927447.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-23/20210923144919809274.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_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 17856 bytes
SHA-256: 75942b48271b20f9468a6bcb57cfb8fa64491f43cb53474955f025dd58a5b2ec
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 10572 bytes
SHA-256: 719f1fde1950b712f9347a49968b8ebc6a0f0a9754d287256e8947262fba57a4