Malicious PDF — malware analysis report

Static analysis result for SHA-256 196fd55f081808ff…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 371609c3b1c4af75b87322f9080d9402 SHA-1: 4162df246f20b05467fa15fe40a3cb1f575af7ae SHA-256: 196fd55f081808ffbd1ad337dbf21941a94fea280a77dbe333c2d917432368a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thai-apsproducts.com/file_media/file_image/file/xakerevokalepez.pdf In PDF document text
    • http://lachina.cn/upload/file/4971350689.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mudizejujixobokaw.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zikegarigapilesedefig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c26e6ca2---jekuz.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/viwojazujuzoke.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/lezuxudozaxijadi.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jifarivupopor.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/20086499578.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/47021920092.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/40699281388.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/pibejajexoroja.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gugafofuj.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/potiga.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/xuxuzexegikinarog.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/losamita.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mesagimizexigog.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/3618953555.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/81810008375.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba22a02d4d---49852324445.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/57445273720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+make+a+video+live+wallpaperPDF link annotation
    • https://mediaget.com/userfiles/files/89839516106.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 19076 bytes
SHA-256: 7fb80eae8630531e9f443e5f6f865430bd02cebd95b0e8f5b3f700654c44e1be
font_01_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 10416 bytes
SHA-256: 62186247fec75866e2aa9b9df0d15db20ed101a32f74cfb7cd487c26a08e1bda

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