Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e62ca2afe27b23…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 18:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b07c805f377a7192daf2b483b5182bf SHA-1: 89d6a8c9305421bc1cc093539c13847d6fa6bac0 SHA-256: f8e62ca2afe27b236782116e69e921144c665e3fdc9222c7b68eeb183321ff15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://huntic.ru/uplcv?utm_term=idm+free+download+apk PDF link annotation
    • https://joebalogh.ro/imagini_ws/tefogo.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/65751504132.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/14563645421.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/16334128450.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/72060399354.pdfIn PDF document text
    • https://pcetravel.com/files/file/62287671438.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/59073893352.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/nokusatizalivet.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/49980824126.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433fea52be3---51776065981.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/pajilabepixuruv.pdfIn PDF document text
    • http://fitviewer.com/files/file/geseribosozimebog.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/rebebagarunezut.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/57640179678.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/44120683081.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wemezu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613917a77280b---jelef.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/41934740012.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/lebitofexako.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/rofizoselasasonesixilijoz.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/tukorexapedug.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/41157215526.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109021014065771.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 10428 bytes
SHA-256: 0596347487581dc7ca14a0357008bed4f785362df6dd9d350cd12b4d17eeb932
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 20204 bytes
SHA-256: 118b71d79e64ac9068dcb61b7a1f707cf3973689a3085d67be536ea4b2ae4b90

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