Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b51e085566b359…

MALICIOUS

PDF

78.0 KB Created: 2021-10-18 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31756e08374a2f35a6874d1db7e014ce SHA-1: 84ca0cf133beb7f5a449f71fe08b344bdbcfca23 SHA-256: e6b51e085566b359e99be52e4365cdf9a84684c5dd1111489a6b890bac109f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=thermodynamics+chapter+4+solution+manual PDF link annotation
    • http://solarissoft.com/img/userfiles/files/pilaxelopobofinadebi.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/30192807836.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/92508812144.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/waronozop.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/venigalesulujetokaken.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/nabinawavaminup.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20211001204754.pdfIn PDF document text
    • http://video-cycling.de/files/file/60246640489.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/61780964056.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/16288321045.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kewevuw.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sonenimanofiboluzej.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zevufupe.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/81642337919.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/lakebikuxoxe.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156eadf78d94---77385990458.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/29608249808.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tijidosesapukadilipuwo.pdfIn PDF document text
    • https://lyna-garage.lynacarrental.com/htdocs/cljr/data/files/bubakepuvokabexopejijupo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/jupugejuroruzetibatumibad.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/semiwevavuzufinibokonus.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/888b5accb56f136386949720a102a581/60012249864.pdfIn PDF document text
    • https://windsbs.biz/files/file/toxubobobaxoxinosevuwomav.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_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 17680 bytes
SHA-256: 921a7e0b52386f22d0588eda6a14c10f7992249dfd7d5ba00f51c8f6ec9eb526
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 11036 bytes
SHA-256: 12c040b34d67847887fc044c4f8af584da17315f4e0876a89dd49b28bce15b8b

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