Malicious PDF — malware analysis report

Static analysis result for SHA-256 6392e855656619f4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 01:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eae2b05a110478d62bea9bfbc63e4b55 SHA-1: 29f63f8a26c84d1fea346aeeb3a1a6275204e911 SHA-256: 6392e855656619f43dedab1972b4101d36f59fe32e31cd8a467192fb64dd784c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=bnha+movies+in+order PDF link annotation
    • https://sportyou.fr/ckfinder/userfiles/files/97933475135.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/tobaxubopusekorabolez.pdfIn PDF document text
    • http://sun-tes.ru/files/file/jetamuxigino.pdfIn PDF document text
    • http://chinalabware.net/d/files/feturonezapugizerojunovi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f331d332---8329967022.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210911195710591085x9ovy.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/48877580452.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/62369092077.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/54224489415.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/mavewaxiz.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210912_B9813414E20D1AF7.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34805908152.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/wogoloroxinonu.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/razolejolitexufemune.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/86602238434.pdfIn PDF document text
    • http://donghotam.com/luutru/files/98594744769.pdfIn PDF document text
    • http://stylekd.ru/files/91843890786.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/jefizefer.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/27431880807.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/susadako.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/3814111624.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/dokubizifajura.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bibugapoduwajadenu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/8495490743.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3ca06cc4df4a298ba8597f2037f5755a/fugobulufudokegukezaba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10488 bytes
SHA-256: b826e511cddee104e26bfeae618e52b6b931f51157b9fe480e6d425ceb1b84c7
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 18972 bytes
SHA-256: 75f721c2b6c0b2f4f39620838626c3f3524b1209fb1599e32d57690f807b41cc
font_02_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1