Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7210799fcaff8ec…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 08:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a0704baec3a468ad0d0c23e9021c8dc9 SHA-1: 9dad116ad1a94a76cc95ef67e6fda6046b952642 SHA-256: e7210799fcaff8ec1efb71dc51a136615662817cb6a794b7f96da6d559887c49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2972641ea---8512779349.pdf In PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/jojozivowil.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109151849288978.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/bovatijemoxolarejonal.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/wotadiwenik.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/vulatanibepojugabitisawo.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/jetawubedojale.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/4304784508.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092616013951.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/golimejelimavuge.pdfIn PDF document text
    • https://chineseclothingonline.com/File/watowisudolofofesovotosu.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/22999288749.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rirefovaxunalajigewatapul.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/40458240687.pdfIn PDF document text
    • https://heureka-cz.eu/files/mogafetimitige.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/pedafaxegiboxos.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://togeltop.net/contents/files/zewuduwovoxutatize.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xorewasakunurejimuxifo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/53507610444.pdfIn PDF document text
    • http://bienbao.net/uploads/files/76374127769.pdfIn PDF document text
    • https://protrialse.eu/files/files/kupitarisenikulej.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/dd7213897b43f488002e5203bd5cbbb5/95603520796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+screen+lock+passwordPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/37507171206.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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10784 bytes
SHA-256: 40fb0015aa78be5aa7e09c2d8a29132e53c63e9449002294aed86a8eaa540ff1
font_02_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 14888 bytes
SHA-256: 90290e40825a7637b62e3a87a1d6b23776391f5e72502cb3c35d3df1193b386a