Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b3feae02fe42f5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-26 00:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 287def813bd97ec418d2166b529428e9 SHA-1: 9a68c49472597acd1524468ebef3575f53795ad1 SHA-256: 24b3feae02fe42f53ab403e7eabc7e4644055b1d4c71e12f7f1c3b0346ab5e48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://santa.sg/images/users/00000000/files/37357030139.pdf In PDF document text
    • https://hizlipin.com/calisma2/files/uploads/6927211831.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/21888080491.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/fafokinupejiforuluvifas.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/9415851129.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/69f082ad01a489463a1169e641f1cefd/35483932586.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ec56439595236c00315639d88792841f/57489404667.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/wurijakoxewefekirone.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/jaziv.pdfIn PDF document text
    • http://newo.ru/files/files/boferomopadedaj.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jizufurunatudijilixig.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/26046237995.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/72885723451.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/66055292275.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/54598527960.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/nesupalufifodovuwedel.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210920_C2F5972E9019A26C.pdfIn PDF document text
    • http://geoman.cz/data/file/pupijoxoxi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/jizipotubavudadodebebin.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/76272328484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sincronizar+contatos+do+hotmail+no+androidPDF 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_off0000bc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2A 10640 bytes
SHA-256: 3df90e5578c0d58a41a545dd822626cad809f318ed0620f90da8747ffac66dc1
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 19076 bytes
SHA-256: a3d44ead949361660ada57f03d5220703b9dae4fc8c429cadd6513cda437010b

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