Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c5d485f22224e6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 21:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 68d65966e0ba22917276bedd4a972cff SHA-1: 498e87fb5549f0a1eec7edda406760f294e0ff9f SHA-256: 63c5d485f22224e6ebc2f9d0804b4be58ceffc5a0b5c79cc92bc476f5bd317a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate structure designed to obscure the true destination or to distribute a large number of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cnsgawefgl.netsociality.com/upload/files/rojuwuwima.pdf In PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vesuvewolivapibakuno.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/saluxazu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/41151978567.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/litobis.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/wiwuzogigixorotabo.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/xuvaxuninudifimojuwusux.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/53827917249.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/73130826443.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/jetowuwisipipona.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47301590122.pdfIn PDF document text
    • http://kotolantopeni.cz/file/sejemibixo.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/satejosoxid.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/kilatokifaz.pdfIn PDF document text
    • https://susta.vn/userfiles/file/5754774941.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/62236214549.pdfIn PDF document text
    • https://linker.tw/files/rilixel.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zepuletofovupedobaba.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/gakegagoga.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/66543255009.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/23451756918.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/73316598848.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/1449589807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nba+2k+mobile+mod+apk+unlimited+moneyPDF 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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 17432 bytes
SHA-256: 8a1b747bcdf0bd858f4b76403a9d7922c8b9bd7b5c43aa9dbc9d459ce8d55cdc
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 10828 bytes
SHA-256: ee272c58ce06911b217f6c4d3b153a6fe7ad0325f71649e967849c38df5f8a8d

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