Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6cd0f97e32b92d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 13:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 021f4a67547551d57caf5111f80e022d SHA-1: 4c17008db43ca9becf0c4005565390e851e77f4e SHA-256: ef6cd0f97e32b92dfefafe6090261665c634e9a15bf8ee34b53f87dc59305317
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. The PDF contains numerous links to various domains, suggesting it functions as a link farm. While no specific script content was detailed, the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of many unknown URLs point towards a phishing or malware distribution scheme. The embedded URLs and the overall structure suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fence-alarm.com/userfiles/files/55712911948.pdf In PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fosunonogolatulitopop.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/zenip.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/napemogewelixuzupim.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85746924120.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/21855119053.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/nedekajemariresate.pdfIn PDF document text
    • https://stopserv.ru/files/file/69751927023.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406200c002a---26877643910.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/mabizatamitigivizogutiv.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/17510250327.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jukodupuxavubotuzunevom.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/71388626723.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82096455335.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/28460467540.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/80186020673.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/73158533105.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f1b1febd01f889a3234307bcccb1655a/gutekubawenedu.pdfIn PDF document text
    • https://udruga-invalida.hr/files/welezuwato.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/nizadadowewi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/ridisasikapesi.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/31623940283.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/11160261134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=appli+dictaphone+pour+androidPDF 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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 18760 bytes
SHA-256: 600fd7ed54edee52d236639a2081da9694f4ada789ccbe76cf25b670c0c95f73
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 10524 bytes
SHA-256: 6fcc508199035249f89796e89c240b5b7c75033d163a881662662faa174f2df9