Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08c150be7559c76…

MALICIOUS

PDF

96.1 KB Created: 2021-10-13 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81da616b701beb16be52e43f47329528 SHA-1: 7ffa9f03818b8db879b48c7473ff9f97514756b9 SHA-256: d08c150be7559c762d882ccb4b7c3ffa7b40ae911c5fcc45efcb96ccae8aa185
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document likely attempts to create a false sense of urgency to prompt user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aicpwdosaeast.com/ckfinder/userfiles/files/tanemedulufuw.pdf In PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/sosafoxivelof.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0377887a915c9a2a278d277cc5c31446/toduxopujaduzilezidam.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/np1uge6viabrmt88jr0i9ngdmt/vesipora.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/211013075043141856lh73kj.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/fateruzifob.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/wezonewazasesin.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/ripivesulezelobimus.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/18502438149.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/41525953773.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/21406176165.pdfIn PDF document text
    • http://obrazyramix.pl/userfiles/file/kuvaminololalizaxukusoj.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/7123566180.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bifevusujetal.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nowogifarezediperalerog.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/66501993254.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/9803081268.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/tiwuzedikobim.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/67460888296.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gawuge.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/18851171316.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=blank+release+of+information+formPDF 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_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 10520 bytes
SHA-256: 707c54f1d095366e9196d407153df7c592719fc4eb5605b52ba5deed060709a7
font_02_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 20700 bytes
SHA-256: dbcf2e22d89801e2e51390ab60af271c1ccd22d28f88ef057d40edb1e85a189a

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