Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab07f5531b6fa88d…

MALICIOUS

PDF

107.3 KB Created: 2021-09-16 20:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 858cce54fd2602e4b549db5f2be2c566 SHA-1: fb2f1052d086ad8475189602613569329c129012 SHA-256: ab07f5531b6fa88d63d0bd105df781c5fc8919dcc03fde76df04fb7449701310
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=postal+code+lubao+pampanga PDF link annotation
    • http://neza.cz/UserFiles/File/ponupuvis.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903142145.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120036313466.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/wixuva.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/mazaporurafinibasaxapag.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/57533767553.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/76641740801.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wofopitebijojepoxipun.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/wadopenasijimoxukebeluwug.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/21334607699.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/35097890355.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/48459564935.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/50610159998.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/wereti.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/66457930598.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/38577147218.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_off00013db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 19292 bytes
SHA-256: ef1ade87f5fe1c747961ea6e28c0e06011ef34104d65b291c8316af34797b337
font_01_sfnt_off00016fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187DB 10904 bytes
SHA-256: 3616ad2df030fe1f6e16dd04038b58cb07f9c8e1ba5667a495d250b6c04f0f65

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