Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50fb7e1bc265407…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 03:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a65411ce92b7878056c541b3afb1dc2 SHA-1: 9f27f7928ab91cd837c2d1ceecc494d27b1eecb7 SHA-256: e50fb7e1bc2654079abfd4b0fcce2565325c4eacde20968848ec6dd0c67a023e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious intent by distributing links across many disposable domains. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=1k+followers+instagram+free PDF link annotation
    • https://dveropolis.ru/upload_picture/68772541174.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/81466388086.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/92546519488.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/dixil.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/44292811231.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/12491977773.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/15123563893.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80581319612.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109051350364066.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lusuporekumu.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/4394571948.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/97066789583.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/midoso.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/71983640336.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/dived.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/26743838074.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zagupakigelukilevabowa.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/sibipawezizilinaveneleza.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/54830955970.pdfIn PDF document text
    • http://smirna.pl/files/file/pojodijuwexifi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161333b8eb5e82---91508177902.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10688 bytes
SHA-256: 48ad56f15739a07ab40b156bd389181e5ba0936d8bf2d0ec240eabb2719dce97
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 17852 bytes
SHA-256: 85d3669f05fe2e22b20ad7133d8e9ad621da206c6bc2870ce9f4f466079a81dc
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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