Malicious PDF — malware analysis report

Static analysis result for SHA-256 7708a5a9d5a2e995…

MALICIOUS

PDF

95.1 KB Created: 2021-09-11 23:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a5e6e54670330ee96a4b020df9a877e SHA-1: 25d26b73595cbf6877bcfe575db5bff83e421211 SHA-256: 7708a5a9d5a2e9958fea96b326b0ad4493a40fd9da55cd66766a506ce202c798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely involving exploitation of a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://adeptos.clevercloud.pt/images/items/files/67546383522.pdf In PDF document text
    • http://www.valaisconsulting.ch/file/luzokosoviribekoriba.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/75190648740.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/26602499595.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b245f5ddbe---86080588302.pdfIn PDF document text
    • http://juha.be/_files/file/73087572765.pdfIn PDF document text
    • http://kelvista.lt/images/files/19375734486.pdfIn PDF document text
    • https://europartner2.pl/uploads/geminiganiromokosi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/51844556621.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/xutexejodovodakuxituz.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/99666340340.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/19577418306.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/65726456593.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/pevevegivudejosomomenaton.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/56bf8e5a3e0b6934d30d8dabe1d6fe82/47605066602.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109100701064317.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/84633894086.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/befin.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/66915947505.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nixusosurerisujemerasafow.pdfIn PDF document text
    • https://togeltop.net/contents/files/39684627395.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • http://dentherapia.hu/files/file/fokelagebano.pdfIn PDF document text
    • http://boldogelet.hu/media/11148421805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=demon+slayer+full+movie+english+freePDF 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_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 19108 bytes
SHA-256: ac699be0f950251d549c172f1646c74d5706476f570fdaf3f2878280e0688054
font_01_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 10844 bytes
SHA-256: 6a0cd859c76987929dad5f99cde7264cbaab658f80924b966373cc29d34d0c4a
font_02_sfnt_off0001563b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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