Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ecad8f62d2dcc…

MALICIOUS

PDF

79.0 KB Created: 2021-10-09 05:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2234c174c627dd9c11109902b8d444e8 SHA-1: 37dd0703bcf02ab4c85e2f83fc673b7ef2fcf846 SHA-256: 0c8ecad8f62d2dccd42cef926e7538b944de689d75db94a5ee8b75696fa552ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=stomach+ache+and+vomiting+causes', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/uplcv?utm_term=stomach+ache+and+vomiting+causes PDF link annotation
    • https://trsoftyazilim.com/genelresimler/file/vuwixaduragiji.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/80182436840.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/34467554651.pdfIn PDF document text
    • https://cansandientu.net/Images_upload/files/5837576439.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/34088729667.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/34819193494.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/lorotebageramirejubo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/57358637940.pdfIn PDF document text
    • http://mojaksiegowa.net/userfiles/file/badoterutexiderokepox.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914065222.pdfIn PDF document text
    • http://esipro.be/userfiles/file/76232763604.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141126c1a5cb---wiruxirefobepikox.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tofarovimuxif.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/26401083924.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/84535789678.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/derajiliv.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/gopagetefutok.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c614d8f3e1718ecd0917c78abfdebc98/31663641882.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 19020 bytes
SHA-256: 5b3516d50385845fcefadad0dccab392fc8c31427ec7d3e7f65e025089c6c02d
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10912 bytes
SHA-256: 04e4b6ff2f1b24983b08317d49e124bbbf83a7adbeaff80fd85b4d2b704f1217

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