Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fb79efbdc5d3ef…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 16:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd3b72f3e74b8e9b3f3254b9d91d4d79 SHA-1: 01ce2d3d2e904a444ae0294ce5a8f86100207018 SHA-256: 96fb79efbdc5d3ef6c8c09c1d73d7c55c8c91e673d1737792007e357401fef19
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://osikovo.eu/webroot/img/content/files/wisudedelekozabuzemi.pdf In PDF document text
    • http://dakov.hu/_user/file/baxaredelebe.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/55972813435.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161459474929e9---zojatizalizunasaz.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/12454602932.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090114063070554.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/welomoxoketujitirawe.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/veluzugatojis.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/guvosogosofurefikapoz.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/84991412415.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/320498971.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/11678792165.pdfIn PDF document text
    • http://www.moyekolodin.com/files/47383252299.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/nolexekatezawomoxe.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/dubekij.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/kovupizulasipujo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368a3b98f22---30480521302.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/36222362000.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/roduvilimakit.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/65119425927.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109151949353592.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/zazododakizipinima.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pigulivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=top+livable+cities+in+the+world+2021PDF link annotation
    • 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_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 11160 bytes
SHA-256: 877e2b8d0b18e591e5059bd5858e09fd4e9a75978b26ea910c81e88c48cada0e
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 17876 bytes
SHA-256: d946b3926ed36eda0b683102ba1790e629766ce6daf773fa63557a5579ad94e4

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