Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da503b422a729b3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 09:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c7491e617e0b5233767f21f45f5784d SHA-1: 440fa7f8b67f66c3af99de212b66c925d4336a20 SHA-256: 5da503b422a729b328ba8649c4c5f6c07e6d68626d3845db29d997a7a24b9503
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to other PDF files, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=free+download+toca+life+city PDF link annotation
    • http://sgo-bage.com/public/files/files/kepup.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98758288933.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/84241678111.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bonog.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109140511049030.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vidokixolarisotekelenejib.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/kewusubidusu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/wejisoneriwitegasisi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/26479738931.pdfIn PDF document text
    • https://5uempat.com/contents/files/lidexid.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/69a4204a121e8fabfd75c75e30673605/38970883072.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901100050_cepn9m.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/19234558096.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/sasenatalizizifadal.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/24027339307.pdfIn PDF document text
    • http://kaies.net/upfiles/file/98485722762.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/tesiwejoxafoximigepidalu.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/5321304795.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/gejagoralilapepaturexo.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/27276631753.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/ludaxamimebu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/65976328898.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 19508 bytes
SHA-256: dbeb736fb4e48fa646e6a85506b57bca60e0c733fc32217d9d8993ebb315d558
font_02_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 10480 bytes
SHA-256: eb62558556335e919cc9bc121ba1b569dd7e83481b03489743c1546d7ed530b0

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