Malicious PDF — malware analysis report

Static analysis result for SHA-256 1105b4516bc361a7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 23:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a249fad2c9d443a41a967165fb7f558 SHA-1: f888c020f3fc957c34c99e1b3c199cc5254713e6 SHA-256: 1105b4516bc361a7041334db7b90b33aedd5743072ece7d9ca088d130830c2b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as unknown or potentially disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm intended to obscure the true destination or distribute content across many low-reputation sites. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lomasdelaweb.com/userfiles/2008.09/file/bunirevulogaropumuxiratu.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdf
    • http://sunway.me/ROOT_PATHuploads/file/07051909470.pdf
    • http://xinshifm.com/userfiles/file/mifuximoxurikawijiwik.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/gunuwonomefivu.pdf
    • http://novafish.it/userfiles/files/73331170962.pdf
    • https://principesgs.com/userfiles/file/82245440521.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/jatesog.pdf
    • https://rm-parketi.si/uploads/31856565149.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/67161785994.pdf
    • https://equinox-e.com/upload/files/kozab.pdf
    • http://sellmysayarah.com/userfiles/files/govopemoziditisuxed.pdf
    • http://dataction.org/demo/dataction/media/dixevisazisuxi.pdf
    • https://dnmpaint.com/sdcc/images/file/93378516679.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/fageg.pdf
    • https://bestcoloringpages.com/userfiles/file/65907309830.pdf
    • https://saikekanglun.com/filespath/files/20210910075902.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/78621155441.pdf
    • http://xaydunglenguyen.vn/upload/files/c45c82.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/fawigajimedujilepi.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/78366192360.pdf
    • http://ajtoablakcentrum.com/_user/file/bejabapadede.pdf
    • http://streathamtaxi.com/survey/userfiles/files/zajixuvorisiburawad.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jonazatok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+phone+wallpaper+app
    • 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_off0000de06.bin
d165d5bdbcf1c57c11b5e10b5672104db2200d1bc183028904ddabdc534a5f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 18260 bytes
font_01_sfnt_off00010d68.bin
ec732b9289485171c0654aa16979a78b305ce13a6b9c164b527ccc4fce7d746b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10396 bytes
font_02_sfnt_off00012506.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes

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