Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3dc2ca568f8a63…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 12:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43c987967676ea575c806e2c3dd29cb2 SHA-1: 1d320f697a99427edcbc478bf88b49098e935836 SHA-256: ac3dc2ca568f8a63158a8f22e2a1d218851cb5c16ed44222f6bda151737063b3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mannadey.in/FCKeditor/file/vazopofoposibewes.pdf In PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/ditonedugubexe.pdfIn PDF document text
    • http://marketingnews.fr/images/file/75776765314.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wopebenewukelelowomipom.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/4675695837.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/raputumakenixugimi.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/tipivitimetatoje.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/83933054937.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/reranuvoxenepelikadijesu.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/6445200050.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/61168704360.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/5733564080.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/loroninimeve.pdfIn PDF document text
    • https://teamcode.net/upload/files/90335502237.pdfIn PDF document text
    • http://jinyezi.cn/upload/98478764898.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/64220621983.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/luweru.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/26796977018.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/kojojife.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/fubanovagogupesofiwe.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/29022589227.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rulin.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/toxigokazofajerizigapu.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/sikovopede.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/limulegivaberisokitepazib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=idioms+and+idiomatic+expressions+pdfPDF 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_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16848 bytes
SHA-256: c09a83d8a7eaeb9bfb6140b0de3765c992b12479b403cd874ff1dc5451d7feca
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 10788 bytes
SHA-256: 380eeced3e3a547a7c23e3ab4ac68be4f039b45985cd2307f8a462bfb01726b7

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