Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e424f0d3ac829f9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0758af97d091a56a5798c4d0b149eebf SHA-1: dfbfe5447295ce5832f160ded2ec90f665a36f14 SHA-256: 5e424f0d3ac829f90552cf93bf45c5767932abe25ef338ecd6e69e6646def58d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to obscure the true destination or distribute further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://irlanc.ru/uplcv?utm_term=recover+deleted+word+document+android PDF link annotation
    • https://clubon.top/uploads/files/95934995706.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/junugivavasaka.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/11337027161322916caa4f.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/18943201935.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613994f4494e5---15293334143.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/funobowurenedasej.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fujajereralo.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/16000681472.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wanor.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/20357790526.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/39465428573.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zifubaxowewexozotipi.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/34015583922.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/61998802462.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vujepuxebu.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/lokavimexesomozigir.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62497666687.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/89081259336.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/5408214309.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15c88587---70224330253.pdfIn PDF document text
    • https://shidoremicrosys.com/media/13950177164.pdfIn PDF document text
    • https://dhesient.com/media/kabebebepo.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/sigeluluxojunijube.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/tebamar.pdfIn PDF document text
    • 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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 10660 bytes
SHA-256: 382d29a2ff6aea36002f257dbb58411c8371ebfdcac2c498bbcbf4d20042ab56
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16692 bytes
SHA-256: 28dfcaf0e31c9e66a51f3b5c0abd4ad9b8dc27ffe9f937547b34e4e17d6f121b

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