Malicious PDF — malware analysis report

Static analysis result for SHA-256 79391ce0703a921b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-16 02:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bbb0681030d78adf6892573985e5e41 SHA-1: f8ed2a4801589965ca6e2b9f8471eb81c9d8d46e SHA-256: 79391ce0703a921b1914df7eb65873d1a2caa32dd89cbf4ecffb4fe3bdef820d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=best+music+visualizer+for+android
    • http://mansiya.com/uploadfile/files/nakuzexoxo.pdf
    • http://bibliotekaludwin.pl/img/upload/files/jefazalodaberogelok.pdf
    • http://alburigiott.it/userfiles/files/73691576360.pdf
    • http://119pump.net/d/files/xabatu.pdf
    • http://baugeraeteverleih.de/benutzerdateien/76721704588.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/jizikipiwiwegenajobup.pdf
    • http://seritour.com/rsm/files/7029492376.pdf
    • http://metall-press.ru/files/81360751620.pdf
    • http://angelcabrera.com/FCKfiles/file/wixuzumu.pdf
    • https://dom4m.lv/userfiles/files/sibateroke.pdf
    • http://annabarons.com/files/files/nafofofejapa.pdf
    • http://kht.civilkozpont.hu/uploads/file/nebafirobesele.pdf
    • https://safe-international.com/userfiles/file/59962888001.pdf
    • http://www.tramag.pl/upload/file/sikaxiguma.pdf
    • http://seibyou-koujien.com/files/files/80142319936.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/95548696313.pdf
    • https://sindonis.com/userfiles/file/53253311335.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613165e6b02dd---lavusitenosasane.pdf
    • http://madurastones.com/userfiles/file/fenat.pdf
    • https://cursosadistanciayonline.com/medios/files/vizunetu.pdf
    • http://hzqzg.com/d/files/31493433287.pdf
    • http://clairvoyantinfotech.com/demo/images/18166554906.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/musosobin.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/16f2717d1a1aa1149e1577a5c57e6c59/zawipaworalob.pdf
    • http://pk.mo/userfiles/file/toxebijutanavife.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_off0000f816.bin
e85b353e3961500abc2aee6818b1ee425125330bc7758da1af7f47c532034b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10916 bytes
font_01_sfnt_off00011173.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
font_02_sfnt_off00012985.bin
4ba1add9d41f57592536a188f104d7fd2ed80add26db44f6f0c688cd753962e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 19800 bytes

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