Malicious PDF — malware analysis report

Static analysis result for SHA-256 926f62b8b41acb75…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 23:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84c5467dbb9c526a20ecb26675e2a2b0 SHA-1: 463c23976444602d5d5bc1c2e5d650dee56f9276 SHA-256: 926f62b8b41acb7547f8b0239d4c5b22233766552fa4be4b931e70c716e5c225
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wilocom.ro/ckfinder/userfiles/files/kijibusivumufowav.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/gewabirojebilajowe.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/ropoxusutuxiga.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kalaxub.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/25963662266.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613789487d4bf---725251508.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/65681113958.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/kedemobido.pdfIn PDF document text
    • https://atrax.hr/files/razoravezitewel.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109152204136856.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/sojigamigafuve.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/55046756967.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/mizuza.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901192212475131.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591dec7da7---48648596761.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/57291817467.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/46649226830.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/libabumojujenar.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/gopepudularume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=midnight+sun+pdf+online+2020PDF 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 18024 bytes
SHA-256: d8c610d43769b038f5edc197c3be95ceb154ff6fcc0174c45aa52395fab99eab
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 10852 bytes
SHA-256: 5a3b0cecfbc7e83c3517184b614ee9f7d634666d208d71dc68d9f9e6265b9601

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