Malicious PDF — malware analysis report

Static analysis result for SHA-256 9419eab5337c8df9…

MALICIOUS

PDF

82.4 KB Created: 2021-10-06 21:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3cef212437aab191e0c63b6a470782e SHA-1: 553a167a14f589ca806d7f56c8810f65ba08bf21 SHA-256: 9419eab5337c8df92c03300936b812869ec81ea2c393e34a4b29f637584326c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cukimentescukraszda.hu/files/files/32865999705.pdf
    • http://sonsuadogo.org/Images_upload/files/jadumoruralajiwodapider.pdf
    • http://wsp.pl/userfiles/file/berano.pdf
    • http://studioesflores.pl/obrazy/file/sopupudevubimivo.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/fuxiforolaluxefejexi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153be3ae1b7f---jasexapux.pdf
    • http://tichdiem.surecare.vn/uploads/userfiles/file/zugizukiwumunomogipag.pdf
    • https://2winit.com/Files/files/62711103881.pdf
    • http://nigerseedindia.com/uploads/tezelaxezikagewazazi.pdf
    • http://www.yoko-ono.be/images/userfiles/file/tobis.pdf
    • https://niboparis.com/upload/fckeditor/files/97607771285.pdf
    • http://iltorg.ru/upload/file/35485761010.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/61g2q66imia8koskbovabtrcok/52069445718.pdf
    • http://gradn.ru/uploades/fckeditorfile/23465597892.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/tozifivisetoxenagunave.pdf
    • http://bamila.vn/luutru/files/bexuw.pdf
    • http://imbirimbir.ru/files/6147997868.pdf
    • http://ehomeforeclosure.org/images/file/bomikotebibik.pdf
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/katisijesofa.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/22501783846.pdf
    • http://abwessex.com/uploads/files/robafavazigipe.pdf
    • http://yourbuilding.ru/userfiles/files/jufunatizutojef.pdf
    • http://ergakiland.ru/files/files/27997178376.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=executive+summary+report+sample
    • 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_off0000db87.bin
08fa61a19f01c272758630bae5a0333996ff6e2a544f7ce2de00d7f14607b1d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 18308 bytes
font_01_sfnt_off00010b05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
font_02_sfnt_off0001231c.bin
fb105aad30661f0e36b9e4c7979fa2714ed579ae397b138e8d9034447881a840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 10796 bytes

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