Malicious PDF — malware analysis report

Static analysis result for SHA-256 74709af14080b9b8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 00:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1f513523386e8a6c6bb84e06ca5b824 SHA-1: 0f331d780ff7592ab3cc4e0b7a5689af2b12f2cf SHA-256: 74709af14080b9b8a3f03756cf503eb6c2fc1ebd73c95601921ea66769d8edd8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ozmutludokum.com/userfiles/file/92642858920.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nelatanotupurasupetenaza.pdfIn PDF document text
    • https://eklyps.net/images/file/64518231139.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/zogogaxegoxavino.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/1360467306.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908144710.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/zajufewazos.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/49652928766.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/josedidor.pdfIn PDF document text
    • https://maria-galland.ru/files/file/88651600521.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/62078315508.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/27933497936.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/80777992418.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/verararazeb.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/17584063295.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/febebanojirotajivejijupup.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/ninog.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/rujewoxekavapixe.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/gadisovixalufigemawiro.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/1635107420.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/vidabetenogep.pdfIn PDF document text
    • http://horvathortho.hu/tmp/28163512578.pdfIn PDF document text
    • http://gptools.net/userfiles/file/midifojakim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+secret+book+pdf+englishPDF 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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10932 bytes
SHA-256: 824f3b8b21ed6b9f76200f2bab880bf57899c7fa85acf755065078e5385e9ba1
font_02_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 18656 bytes
SHA-256: 2e77cb8d2f6a29ac2d2db6733cf9d3bb4d874f8a72822d945bc44787d8df0515

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