Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279cd1e8dc2efb2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 02:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f449d6e31385a478e6689319f5e33855 SHA-1: 9311676dcfa39d7b07e6b96b2ce40212b12faf1d SHA-256: 2279cd1e8dc2efb2be62e1c3ad5b414da93862d0c6a4f0a62aed2135e98cb678
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or suspicious. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://centralgiving.com/media/userfiles/file/67261331049.pdf
    • https://hoya.hr/UserFiles/file/94563582107.pdf
    • http://airmon.hu/images/files/26093845098.pdf
    • https://mr-alian.com/upload/ckfinder/files/32265435168.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/11e208d0e7f8c04a9b0d36a25bda0725/33448455274.pdf
    • https://giasidaily.com/uploads/userfiles/file/3331437477.pdf
    • http://mulroyenvironmental.ie/userfiles/file/22964423651.pdf
    • https://strategieb2b.ca/userfiles/file/52911012162.pdf
    • https://firsatoyun.com/calisma2/files/uploads/57791979540.pdf
    • http://abwmercury.com/uploads/files/nemaralata.pdf
    • https://rougezenekar.hu/files/file/13042915095.pdf
    • https://oldd.adventurenetbg.com/userfiles/file/46820769157.pdf
    • https://euro-m.si/web/dokumenti/file/sarenusulajaxojawi.pdf
    • http://gloteckr.com/upload/editor/file/36893068576.pdf
    • http://moda-minulosti.cz/docs/momin/file/xesilebenafifevaza.pdf
    • http://soyaksiesta3.com/userfiles/file/45511738150.pdf
    • http://quinta.cl/upload/files/lujadanel.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7187db7---94806488381.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/93858059440.pdf
    • https://snapstudios.ca/userfiles/file/98493591978.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/lumisuxebibanulegagor.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/40533259584.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/98332370863.pdf
    • https://thietbigas.net/media/files/91964487654.pdf
    • http://deleeuwputten.nl/site/data/ws/files/23650975819.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vufiwigiwigewe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beyblade+burst+spryzen+code
    • 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_off0000c51e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 16792 bytes
font_01_sfnt_off0000dd30.bin
d16e017477817dbf0ed8f58bbd90b130d5b9c84fe6dbe1142bded06e0f81d9f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 18972 bytes
font_02_sfnt_off00010e92.bin
24e4e3638e6409f04cbc6b7402018994321058a4da8b5d3853528dd989657c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10884 bytes

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