Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc3bc1a1fd01ed…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 13:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c638092b382ba1231ae105d3f538f6e SHA-1: 465829d3735ad3474383c1cbcccbe4acff2dc927 SHA-256: 6acc3bc1a1fd01ed00773f80d09d257c5f641062cbd7f463a5980b7b3af18f1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=new+headway+pre+intermediate+5th+edition+workbook+pdf PDF link annotation
    • http://aedelsur.com/contenido/files/22065712342.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/45983942677.pdfIn PDF document text
    • http://guchen.ru/d/files/95393335894.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99863948638.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/48388478461.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109100046037536.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/kifelirakarewebeguz.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/ganafigof.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1357519104612eb3f64fcf9.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bufafofenowapijinu.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/nadovanikigizuloxojeruv.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2aa5139aa---20259201503.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a7e414460bcd5433a41bcf96d48a386e/95296438841.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/fidafe.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/29826790424.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/83150105377.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/9099848240.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/528604679.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/dugilitalu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/bujuwafudab.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/majefaw.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/tagedekofanex.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/21423816869.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/85708264596.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/90679530245.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_off0000b401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 14800 bytes
SHA-256: f985df2daf6844c9aa2c21304246318b463bbe01fd73161a34a25b7320e67a9b
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 11092 bytes
SHA-256: 1146c3e629d185dc4d4dafd269de98a1a557fee1c234cde12b863c439f8f35eb
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1