Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed3b9a0a4ecf7b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 05:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22348d21fa0e52417e979169c637be4e SHA-1: 616eaa0292438a192187747f7f3fd4adfb9985a2 SHA-256: c9ed3b9a0a4ecf7b8dfc66964d837e98bd7ab444d7693deb638eee31dc3253b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing sites or malware downloads. While no scripts were directly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ormansagszive.hu/upload/file/74757612882.pdf In PDF document text
    • http://yourmoneyyourbank.com/uploads/File/26695843455.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/begujamuvare.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/4810579529.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/35835647258.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/misawubavaseguvu.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/34109223953.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zujoraxixesifobeb.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/73590512263.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39437299129.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/kepenegife.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/6931267579.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mesozisaw.pdfIn PDF document text
    • https://serka.com/serka/upload/files/63295464385.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/23456621990.pdfIn PDF document text
    • http://sentralperdana.com/file/wobupewukado.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/zigurobubevenul.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jogug.pdfIn PDF document text
    • https://miet.hu/kepek/befajo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/36066118654.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/72287383029.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/xewijovumodotovip.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614477a1f2544---28896674456.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/28458401564.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ninebilevofubupib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=live+football+streaming+hd+pcPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/66408487367.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 11228 bytes
SHA-256: da035f4d5b182dd7ca794c574b69e7daa87354a38b084ceb13780ac1a0264142
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 18388 bytes
SHA-256: 59682d7fd89c4ba7377495ab7b94ec4b21206d211fe04083e429a29e889f4721
font_02_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1