Malicious PDF — malware analysis report

Static analysis result for SHA-256 2005999e6b4f7223…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 05:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b07e606cb326606e64a861c049653f3d SHA-1: 59b118802b8166e16c35e60c56aae3dab254538a SHA-256: 2005999e6b4f72230507cfa514aacaee79d9fa83c2a8fba8ba1cc9c30b3599f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://saraya-shop.ru/upload/files/nimobago.pdf In PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56114793667.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zurufanubupi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/55480902896.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/resofibof.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/dipibizitumopumizolenigow.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/62414568775.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/sevesadomomozigesolumo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd10f2f8c9---posuxame.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/1785980066.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/37671041062.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/jonafi.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/50920934438.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/28828009052.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/61299195096.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091009040073499.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/90637002472.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vojatuxasotutamutigux.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909065536.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/subami.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/2053244832.pdfIn PDF document text
    • https://mar3ol.com/Files/files/nufeparivirusamapumabufe.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/viwigibebeselugoxomekeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=plague+inc+mod+pcPDF 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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 17560 bytes
SHA-256: e71e9dabeb376970e06559825132db066d4d71f2682b77701c1ff4f258a879ea
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10592 bytes
SHA-256: 6cd454906cd4cefc197af931837067f18bb1ecc1c82e243d4d7e98d310e65176

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