Malicious PDF — malware analysis report

Static analysis result for SHA-256 3860e753dd6ae519…

MALICIOUS

PDF

87.8 KB Created: 2021-10-08 21:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 225fc1d182025ffa1d69be057f684a4a SHA-1: 7d51a1287bd1af55e306114ef93f7093c2999560 SHA-256: 3860e753dd6ae5196122ef6f3c4a627e2a4d161ab02facd1439e807416b79c12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to lure victims into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.mearesandassociatesllc.com/siteuploads/editorimg/file/66937329280.pdf In PDF document text
    • http://sahcarpets.com/userfiles/file/gumowib.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/23618943565.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/73901041572.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/62146946380.pdfIn PDF document text
    • https://anandalaya.in/resources/file/29909221681.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/1977819546.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezinaburizozazefawed.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bamomubuwufewix.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/51076248486.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vidufadegenulagerewiwiwiz.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/mekiwizivuwapofajadom.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/voxafuv.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/39604540936.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6a0b24e1---87926647390.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/budubexerunupikosidibeka.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vamorola.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15df0abb5---61976810192.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/nobulexuxafevo.pdfIn PDF document text
    • http://kd-council.com/upfile/files/wulukikogaf.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/84323101502.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/dijilavojir.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89770621091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+the+pig+eat+in+minecraftPDF 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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 11016 bytes
SHA-256: fac0c86109ae941cf2e2a80a8779ecf15162e42674538d718bdd18e4e6d22bde
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 18924 bytes
SHA-256: bc13a8c8c998a18105c3ba6105257fbf16b7e7c5fe026fc4f66ba1b313ab40c0
font_02_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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