Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69718f20f8b02c7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 14:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d2bea09b70882919c76386c44cd1ea8 SHA-1: 06bb9d35dc3daf0f3ce1c07ece68a0bc16153ce3 SHA-256: d69718f20f8b02c7a58da84c6756e1d7af73bd72dba53af9ea8d169facdbbb61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cimkezes.hu/uploads/ckfinder/userfiles/files/lujasit.pdf In PDF document text
    • http://vansuloi.com/uploads/userfiles/file/memite.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jimufegozipulabet.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/tivilizaja.pdfIn PDF document text
    • https://alariel.be/userfiles/file/pawifemipufebawon.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/46702139436.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/87800856426.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bopivuvixuxad.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kotukurofuruvebotu.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/13559593438.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/romemajoripigevuzusemefo.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/mosipadufuzak.pdfIn PDF document text
    • https://heyratacademy.ir/file/kudenagafilodojazanixus.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/molasib.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gisunusigemoxixeguturo.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/18020468380.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xebigamaxaniwulubam.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/81125677160.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73474214157.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/45043338933.pdfIn PDF document text
    • https://combrooncom.com/contents/files/waxegifoputex.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/65233303489.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bamofeponidutuge.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/6818635988.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/60167119527.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3612386d---ponutudirupaloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=realvnc+vnc+viewer+apkPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 17332 bytes
SHA-256: 0ebe72fa3b6fff7afe221b60d7512e127e07a600fc5b54741941ea75661023be
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 10272 bytes
SHA-256: ca394c3cb862852fd09ec0c964e41fb96c8f1b1b78bba71e46d02f141f4d9279