Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4c84920bc9f27…

MALICIOUS

PDF

78.8 KB Created: 2021-09-25 09:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f25fc68a31bfcd5c84a15e5300f2ca71 SHA-1: 61a0b74b4cb6e860451ea65f3a693ced8f6c56d8 SHA-256: 8bc4c84920bc9f275db853af5dc389d784a99f5221fde981fb05b353145924de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://proximeo.com/ckfinder/userfiles/files/kidebotilese.pdf In PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/97789994920.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/71467333482.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/zedefasaf.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/76513634232.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/polexomatuwu.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nikutivezobe.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/81973283048.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xavapunodotujixo.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/kifakuk.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4ada0b00e43f216f00e7b9fe18957437/79303372065.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/leluketetezifigaja.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/82170075791.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/75348231190.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • https://kapefashion.com/files/files/dixalatefupezinakejosanav.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wurobenivaz.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/bivizewujevoradiv.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/22003272.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/42099902354.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • http://ipllaser.in/uploads/92740505430.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614040914f3ca---74285377582.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/32047732945.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/91287833968.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/kirirorolakagek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=anime+face+maker+go+apkPDF 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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10584 bytes
SHA-256: bc8f7a11931fbeff0bf0d6f94b2640c430dc907c88b31265bdb54d2fe850bc5c
font_02_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 20744 bytes
SHA-256: b826003dbff71657c3cdcf861b81234a795f8cde1a12f005db7fb8b0d94974d9