Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b805215a2df4dd…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 17:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 822ed015465b2cc5e3a881fab08b2341 SHA-1: 56b9f78ac1323731d6792d38e637a5b398b8c667 SHA-256: 32b805215a2df4dd6128a2d83563e4e41d425569d0fedd0c13916a668e2b8da2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

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://infrive.ru/uplcv?utm_term=stuff+start+with+a
    • https://ducthai.vn/userfiles/file/wugugopimiwesizeto.pdf
    • http://sooclose.eu/upload/File/wapuxilof.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/42793547593.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/wugoponotaripezamulus.pdf
    • http://arndt-fahrschule.de/userfiles/file/92878555274.pdf
    • http://studiotecnicoligioni.com/userfiles/files/76535084227.pdf
    • http://malir-naterac.info/UserFiles/File/zinusilekudewilemi.pdf
    • http://nbmounts.com/userfiles/file/1631495062.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/lekuwavibizili.pdf
    • https://koratspring.com/upload/file/8213758839.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16147af5176704---fupulem.pdf
    • http://trust-law-firm.com/userfiles/file/20210913172903_1075982293.pdf
    • https://willes-gb.com/uploads/files/202109090702422613.pdf
    • https://ecoverservice.be/gallery/file/94987240999.pdf
    • https://truckforceone.eu/upload/editor/file/nakojinep.pdf
    • http://vekosgroup.ru/userfiles/file/dugibexetusaperet.pdf
    • https://jocafoto.com/fotos/file/60118438983.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/zujamunupajoxexos.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/fedalogonatibavumab.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/savoki.pdf
    • http://mawratanews.com/armedia/uploads/files/24855122227.pdf
    • http://demenagements-remond.fr/userfiles/file/20210917121204.pdf
    • https://astefin.ro/ckfinder/userfiles/files/vakufu.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/19340476954.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_off0000ef33.bin
3d4182dc3a33ac9a773e043cf7a11363cb4b7d280a829f6977f3530d58a9256e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 18612 bytes
font_01_sfnt_off00011fae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes
font_02_sfnt_off000137c5.bin
460ca5bcea6540c5ffc71397f4b42fa55d58b0eb3f9ccd3412f0d539f94e892d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 10172 bytes

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