Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc000cd7c9abce3b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 07:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5e5d7197b4e2a3c4fd1f0585fa88164 SHA-1: eeb0bee62104eda8738a7c92e6f7118e06793a18 SHA-256: cc000cd7c9abce3b67a7e31d32cae708baa5e6a6c5ae311e05609359c190ae21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates this is a non-clustered link farm on disposable hosting, likely used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://canxetaidientu.com/images/file/xagafubot.pdf In PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/34692248362.pdfIn PDF document text
    • http://effektfilm.de/files/file/bitob.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/pukazuwenarosovobag.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/93074229401.pdfIn PDF document text
    • https://tierlistei.ch/downloads/88643873654.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/vogariwaliteguxepojemo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/kedavabugosonupekibuze.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/27518632635.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/18112196634.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/dusededudosodij.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/47817719321.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fexegakasogogisuzoxo.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/19951860539.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/99567060210.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/15118462107.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/ruritigowoberixunowufa.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/romuwekenebef.pdfIn PDF document text
    • http://aprt1day.ru/file/43412235122.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wisaleloxutixuzemimem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+color+does+purple+and+blue+make+togetherPDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 17432 bytes
SHA-256: f65ea8eca0a4979a604d1f3bc5b3e826c93c87f7576fa8264eb2d09bd0e2b18c
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 11196 bytes
SHA-256: 8195e2cdc99c9263197321f56cb7e14ba7670ce816d062fb6d9cf45e3fbb5ca9

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