Malicious PDF — malware analysis report

Static analysis result for SHA-256 df095e9ef94da4e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 07:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4ff70dc783ca014bc70c721174fc83b SHA-1: 439861be30ed1ebd29240c43f1eb12a503a2b794 SHA-256: df095e9ef94da4e7c94b068875ecb0e13b5562b26a49ff59fcc7df78dc3d0d6f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dmhu.eu/uploads/uplib/file/61410538645.pdf In PDF document text
    • https://bacninhonline.com/webroot/img/files/xutuluk.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fa65033bedbede8dfb3671c2363a087b/busejobelidofer.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/romisuzo.pdfIn PDF document text
    • https://comfort8889.com/upload/files/liloborejexesamovaxufi.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/38423751469.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fabanubipekogakiduto.pdfIn PDF document text
    • https://tl-systems.hu/files/files/22403730909.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56875313038.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/40251378252.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/waroxofu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/37187565575.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/pazodakerodazukomedozed.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/20717945056.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/winavevobinuma.pdfIn PDF document text
    • http://czminghe.com/upload/files/watumeretadore.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/66313769060.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sewoso.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/92181699412.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/34429695832.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/9940881326.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/57313383564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vipmods+dragon+cityPDF 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 17020 bytes
SHA-256: f3a9877b5331a58ce27feedaf5b09cada10b04df0ba39c52450cc03e0b012b58
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 10764 bytes
SHA-256: 0c402eb2571ad30a6e3652818157b4c56d4fae0dc7f88b7a4984328b8487112f

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