Malicious PDF — malware analysis report

Static analysis result for SHA-256 238e63c567bfb3ac…

MALICIOUS

PDF

95.8 KB Created: 2021-09-16 04:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ece17a256b3521bf0cc832b5eb87e3 SHA-1: f3d5df1acdc8388512ccf51a0e9cf1b1763e5822 SHA-256: 238e63c567bfb3acb58cf191fa59e17a23ec523f9430e6f818e829207f5fc589
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://keralastatetailorsassociation.com/userfiles/file/mupogar.pdf
    • http://maslatalaia.com/userfiles/file/pagazibujalorek.pdf
    • https://webmenuplus.com/images/file/14505796698.pdf
    • http://bijverhoeven.nl/uploads/files/taboxolivefaxuwozida.pdf
    • http://ustunongel.com/image/files/98181315727.pdf
    • http://fishtech.org/uploads/userfiles/file/file/84095453924.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/mumomig.pdf
    • http://nanoscopy.ru/uploads/files/27096010439.pdf
    • https://bunyaminerdemir.com/resimler/files/vimuwetugabarimerijuda.pdf
    • http://szigmetal.hu/editor_up/wogise.pdf
    • http://lrpharmaceutical.com/upload/files/4913575516.pdf
    • http://filippodelvita.com/demo/userfiles/file/momedininen.pdf
    • http://amandamaitland.com/images/file/xifudabazidulowigewekuxu.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/paxujapokuberuzoteruwude.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tqqgji7ecn55i0anpqrignfbt6/taxumenime.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/pozebawumefomibotaxutedid.pdf
    • http://hanstime.com/userData/board/file/gexarujavaf.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/livegutike.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/kejuwekixogotepamiluboxep.pdf
    • https://majubesar.net/contents/files/77077991483.pdf
    • http://uran-berlin.com/userfiles/file/nugerubuvudakubafuk.pdf
    • http://1666-3668.com/attach/userfiles/file/fajusexexitukojid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=meet+the+blacks+2+full+movie+online+free
    • 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_off00011194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16792 bytes
font_01_sfnt_off000129ab.bin
b1cf54f1ea6bedfa5a1a25572e1c0c33ddfe6d385167a69baed51fe97c8a862d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 11112 bytes
font_02_sfnt_off0001437d.bin
7195927bbc46e7949e894a6bc651b3033195f775ccc805afbf7e2e6b140756d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 17936 bytes

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