Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f000a17411e4ca…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 11:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcf69b3f6f9a192d824c2acde912c134 SHA-1: 8183193b6b5426f3d4e4eba3d24bc953db059fb7 SHA-256: c6f000a17411e4caccd499a8e296218e8c02e27182afeebc187cb88cce9a89c2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hakasasi.id/userfiles/file/ponefozorudimur.pdf In PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gadalof.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/24481625169.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/sivenizo.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109032128312497.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sopunej.pdfIn PDF document text
    • https://geloracinta.com/contents/files/16039071814.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/66837918094.pdfIn PDF document text
    • https://parc-hotel.info/file/71861903270.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c0893d7---dijovutabiku.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6da8ccdb---60352962211.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090702194573499.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/78227724936.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wezejafezoxugituke.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/fovopanelowozezujutere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cobra+iptv+ultra+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_off0000b647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB647 16764 bytes
SHA-256: b49b95924a5d03fb8d12901f0a01b64c9885d2f1dbb0987b0e8fe64dc6cbd03e
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10272 bytes
SHA-256: bd411de12cf0dd13be7cae994c9e3d8c273e0ca78a28743319f7a2b27b23fc46
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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