Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1396b4c24639076…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 21:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 052fdb4248c2a13959e84d6298d58a8a SHA-1: b09bf8f9e84d63da01305a0d0fcb8590a3ccc935 SHA-256: a1396b4c246390769cc26aa47523b627ba9c62b6bbfeb91b0dfa049bea90406b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=honkai+impact+3+guide
    • http://seosanhrd.com/userfiles/file/20812673470.pdf
    • http://vimar.ua/userfiles/files/joxefelo.pdf
    • http://seednseed.com/admin/fckfiles/file/gobebarukaso.pdf
    • https://triatlonshop.cz/userfiles/file/xuredibidisuwomanelazuran.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/44828179699.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/nowenosefajalaf.pdf
    • https://imihwa.com/uploads/image/20210912/files/20210912133729.pdf
    • http://ufnk.fr/app/webroot/files/file/risabukenatogawaporapojez.pdf
    • http://rc-mst.com/mst/_upload/files/51886854340.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/40311280344.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivimebupike.pdf
    • http://wojno-stal.pl/pliki/file/47571006882.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vobodomimutixanewa.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/kekaxakinara.pdf
    • http://huile-de-nigelle.info/userfiles/file/13541458746.pdf
    • http://brlairport.com/images/file/88989846118.pdf
    • http://hockjoohin.com/admin/uploads/file/zunemobajapaxa.pdf
    • http://wwstationery.com/files/file/35420857050.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d52505e657---rimesixerunama.pdf
    • http://guowangcable.com/d/files/tasidadepas.pdf
    • http://www.veslovani-vsb.cz/soubory/file/sigiwuj.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/diwedutonujumeg.pdf
    • http://mackyz7automotive.com/js/upload/files/4091039151.pdf
    • http://oldmotorsclub.com/files/file/30168453987.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_off0000b06c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 16792 bytes
font_01_sfnt_off0000c883.bin
c652f8f6c6c64e7deba1bc3368d2a0b04e8a388c3e8a80d1be13d820cc7a77ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 10896 bytes
font_02_sfnt_off0000e182.bin
a2a2d8463939ad0a8f102351cb29a0bc799d14b11e115fb068fd10283576063b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 16972 bytes

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