Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c97929f534ef51…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 21:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4217696763137e824beb2c851de2f5ae SHA-1: 856ac0f239412fb5af3afe655e08990eb5f278d2 SHA-256: e8c97929f534ef5129d7ee7bbd947654d1914257b31843ebe67471a6312bae4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or suspicious domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ahzycw.com/upload_fck/file/2021-9-2/20210902162755328119.pdf In PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/xorepi.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gewojawejitazefuwojuvogak.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/xipovenejudegon.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/bosokak.pdfIn PDF document text
    • https://bachson.net/upload/file/sodevimifuxikiwegegomemaf.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/5409330796.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/fatomosiwumaf.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42625146046.pdfIn PDF document text
    • http://epicridesnepal.com/files/xanizafozutexapenakefodu.pdfIn PDF document text
    • http://liluby.com/upload/file/68290977312.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/98363040835.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/10652277621.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/najuzejevarajokabog.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/siretule.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/44503000407.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rebapamagusowudivusifo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139e862ecaaa---dajelifatokuvopi.pdfIn PDF document text
    • http://parlagame.net/calisma2/files/uploads/gimosoxudije.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/64780450051.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mowofuxolegininupik.pdfIn PDF document text
    • https://kaparatt.com/images/File/liforivefenatu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/74525136858.pdfIn PDF document text
    • https://shunnasato.com/tiwigeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+count+of+monte+cristo+novel+pdfPDF 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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 10852 bytes
SHA-256: 85c0a42ff2707d9ceec1697d388f0f8298314bd2d2e1fcbd55f10f934374b610
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 17728 bytes
SHA-256: 570d5f1544aab388a11024caa6e260ef3d720a3947ac6203838f1e31f4a1f14c