Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ccb57f339798d1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 15:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 857af990633620a25e6ffa463cd4728e SHA-1: e06ec0346bc5837b7ee94a245bca56dca72cef1f SHA-256: 59ccb57f339798d1218e51772dc1699e0a0bafd69df2cf21bacfaecd2c91b70f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=tom+and+jerry+android+game PDF link annotation
    • https://oferta.lt/i/File/74449386707.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613571e299fcd---16651111714.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/53268005474.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/44025565847.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/33545143697.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigiwixewowenofe.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/dudanosawesemelomev.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/lisizafobi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/20992759119.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/87605269901.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rufisuwakano.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31501080138.pdfIn PDF document text
    • http://japhina.com/upload/file/fewodebojifujajerigobuna.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/putidotuzizoleg.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/gadugosilux.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/8801346415.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nafuribirawajaraneked.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/masezanow.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/76544141959.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/67149888981.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/40229784420.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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 17080 bytes
SHA-256: e7637a6e6a7128e13fb3d11b4fdbd1cd911e9ded508812aeec3838159a5ec001
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10488 bytes
SHA-256: 90ec94fbe1f853583d9e8d3f09667c6a1f7ca58bd9b251b6b7efc9c20c04e68a
font_02_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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