Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec67dd3ebce1ea6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 03:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e04ec899065482757f240fee277ddd8 SHA-1: 5e13947de80d02366beebe98136c62a550163ec7 SHA-256: 3ec67dd3ebce1ea6dcd40fa69299a7e80e78adff33ff11d362d935615363487d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious files on disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a common attack pattern of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lovesenergy.nl/file/jixelifatetiporoninat.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1923e0c53---4367483052.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/16616143232.pdfIn PDF document text
    • http://esipro.be/userfiles/file/mijosupak.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/48911386638.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/113614e53aeea62aad91c1b8bfc806cb/8841505585.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/48967476443.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/1836151057.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/6551317165.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tikireloxazeselujugev.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/91584723215.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/metinejiroved.pdfIn PDF document text
    • http://progetec.org/userfiles/files/98064415335.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/9932579435.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/67919517230.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/kovajogunozopadenerijo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/zoxagelebujofeteve.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/43407029585.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/rawarikukarumo.pdfIn PDF document text
    • http://maxbrio.kr/files/files/37706186208.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xixasumegisizodiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=4d+live+wallpaper+for+mobilePDF 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_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 20924 bytes
SHA-256: 572da85068f22542304a30cc54b42ce079cdbcb157df75a60e7639bda5d9ff9d
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 10564 bytes
SHA-256: 7bdce1f5eab37d7532d704ccdf66e7b6aa3733fc176346bfc7a11f1989e85ff7