Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bbda63a4486590…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 11:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a83eed6a7bd1c68e777ef7248520358b SHA-1: 6c6f6a69b40130833c662ea878f09865d8448561 SHA-256: 18bbda63a44865908db4806e52183bb7273f22467b3c31c9049afb6a92859c42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://festacreativita.org/userfiles/file/41036020770.pdf In PDF document text
    • http://xtra360.net/campannas/file/xopawetu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614502a8ab8dd---waxepo.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/44579390479.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109062130225642.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/41517697861317457cc457.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/radem.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/vidusiwakij.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/75162430924.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/wikafexekuxil.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/dezufelewewofun.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/95261565364.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fefea03f---92136468344.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/88262480443.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/bakofutamutavopi.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210916053112922271g9fmu.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/26622872967.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/pozuvofepevalajalatuzuriz.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/75475120271.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/43499103202.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/pajowabirora.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/22257055394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+transfer+photos+from+my+computer+to+my+android+phonePDF 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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 11132 bytes
SHA-256: 0be644aaef4169f2aa5286ed2f9744890b772ecf2f4adf4c11c350349d3145f4
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 17616 bytes
SHA-256: e7279ee5113dfc2ab53deeaa6ffc0b655ba57256216091b94f4493114df7b2a8
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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