Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fe6a31fcb88f17…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 16:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72a006909164d376eee0c030b2cb5980 SHA-1: 6c2635f6ec546b8d1aec9300218325e7f9724957 SHA-256: 21fe6a31fcb88f17e65c5d04442e4aa0af4a7d4f5edf61d3286ee3406674d6b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=pokemon+ruby+rare+candy PDF link annotation
    • https://octvads.site/js/ckfinder/userfiles/files/14544759906.pdfIn PDF document text
    • http://jucal.es/images/file/10118085726.pdfIn PDF document text
    • http://afslab.asia/upload/files/sikukikojotixiwa.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gunidaxuvatefume.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zujuwawesizomakizinimuta.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/laberazop.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/22229841680.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/83938952831.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sovifes.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/94537968705.pdfIn PDF document text
    • http://aurora-c.jp/files/files/57712493687.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/34740188240.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jituxoxozazovovozun.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xefizenefegidagomoturir.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kodaxovibog.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/90222295330.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gidetirapolibupisufik.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/maxugunuwazazijo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bda586da7b---sapafabowakewefaberiku.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/golefode.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae89d4ee94---fapurevufosisefurez.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/lulove.pdfIn PDF document text
    • https://trystsalonri.com/images/file/95387513476.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_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 17532 bytes
SHA-256: 549520389a96c40487c7269d2039ac57beba24e79576dd4fdbddab7c465ee3e1
font_01_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 10572 bytes
SHA-256: 70097a3e5788e537027f77bb2f2f835ddf3ddf308728c1af7e316ecd12bff6fb