Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcbf3f0317a92b7…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 17:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e61d7c571c7c2c51a7626fecc5bda71 SHA-1: 8325e0809bb70378bcb6a06346782de153c8461e SHA-256: 2fcbf3f0317a92b7e0779017ee7f160d4c2786841dd78d9c7ae56c76cb332aef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, while many are unknown or benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://grafosaleservice.cz/images/fck_editor/file/87866772940.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7064983---32575634135.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/94295780487.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/67453521553.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/11499408810.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/mudopu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/62722177919.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kepip.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/sotelus.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/53113420025.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130736770eda---nikukewezesoj.pdfIn PDF document text
    • https://agrando.cz/files/file/goxula.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/62237330098.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/66760050039.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/nedubuno.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/tekebenaxol.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/74263251059.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/pubajivapevezut.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/39086358473.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/61687025900.pdfIn PDF document text
    • http://edituj.cz/res/file/2800623037.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/396713525.pdfIn PDF document text
    • https://dm288.com/slicice/file/48636442461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lateral+pelvis+x+rayPDF 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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 17304 bytes
SHA-256: 5cfa38f9a3905006c9d75ee1d50a122e73320ef62d2fc825ae1d27a8ae6cbdc9
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10260 bytes
SHA-256: f8f8b522615fa870a0234397139292d445891e5b7583d8d63d98981728874070

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