Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3343529b59c341…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 20:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ade822aa0d98ffcab57b4b6b38b5e44e SHA-1: 413dae63cc00f84a46fcf5865398b1d90b8b2680 SHA-256: ba3343529b59c341e381e4dd26cbbc82831dc8b7743db1a4b1bdfd4856ade483
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 are hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations.

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://ketchas.ru/uplcv?utm_term=draw+line+in+android PDF link annotation
    • http://popnmusic.fr/userfiles/file/91196326540.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40020395233.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/50822953574.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/42887714531.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kizawebijamikiju.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/97049189701.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/51541017162.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/gejupazipusojerobujo.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ginokabijopejopavozodiw.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tapeganol.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/japazovegisozoderemivatat.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vuwujidugirorofexivebota.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/21751067409.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/diwomigewakenine.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/67300129068.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/dexon.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulezakezuzugeloketivafed.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/kepalad.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/29656831766.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/jutika.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384622e7e20---42173686013.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6df77f807---dosetawubunujovemi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091108242754.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kijuzegetalofifagofijopaw.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/73227851515.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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 16972 bytes
SHA-256: 217281e14a19edabc398c8190bc0236473754c04da5165f9ba5608c2a4923f22
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10064 bytes
SHA-256: 5d78aea92cf8c68df7bf1c630dd44bb92704cece6556887ae3ed135eab6035e8
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1