Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c27c516dbc85c9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 14:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7be6d8c54706532fc283204366ed8380 SHA-1: 48fd774dfdf912b17a859062020cb70cd566fc68 SHA-256: e1c27c516dbc85c9975fc8800203deebad4f143d291b175c3a702a517a95a182
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript suggest an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=android+text+over+image PDF link annotation
    • http://dkmmotor.com/files/userfiles/file/82017234987.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/rebabezegoxubifasobulijed.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/53753832934.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/wodibidonomekujoke.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/85409224629.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/95813095444.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/1286041735.pdfIn PDF document text
    • http://domosplast.hu/files/file/57795444527.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bexutaxamugejimur.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/98550921162.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/rewepisirafexozivatopuxu.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/ravesuvarefedodu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3de9f3f3---48157880596.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/62611661157.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/tolelivekuxaj.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/mopisurupusovipujed.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/foguxosatigulevi.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/87581687331.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/wuvotemasufijipamijok.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/18005440984.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/33622029659.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/59913241003.pdfIn PDF document text
    • http://farmina.ru/uploads/files/72602572690.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/95754964136.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/20901429078.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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 10524 bytes
SHA-256: 82851e4b6ce751244a5a1e7c7aeb6c801e4badb264479b9703771338ad7311d7
font_01_sfnt_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 17500 bytes
SHA-256: 2115cc5ec70cac8bf4750ca8640007a8e4900a1b3cc4b835c43d21873931708d
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1