Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79c6da6d73d9660…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 13:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f81a95a007fdb01fcffcf3c08b14abe7 SHA-1: af8f8411441d820859d3820ef1d2703e35fab7ea SHA-256: d79c6da6d73d96605a23c0031f4046b5b92a2762c3a48b2b618825761576a602
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://constantcontinuity.com/membership/data/files/gisufiritijod.pdf In PDF document text
    • https://lawyerupsmart.com/tempimg/file/19021591403.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/jerekitadirirusotewojo.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/48530407916.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/57760515542.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/39557760311.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/76735509709.pdfIn PDF document text
    • https://kimcert.net/E/file/fubowomipiduwawitineguja.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/jarojavowu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/zutatupekalewolexufog.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/90915858780.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343dae21655---37751861570.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tunupaken.pdfIn PDF document text
    • http://qwerty.pl/_data/file/renixafubipor.pdfIn PDF document text
    • http://dsfly.com/uploads/files/67267260923.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/moxopezama.pdfIn PDF document text
    • http://dgkno.cn/upload/75609510603.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/67816578289.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210903/16306374446997.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/nuwigexufo.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zotoganivuvapuf.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/16675673505.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/zetekavotevazezaf.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/41898533549.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/39894164999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=doc+viewer+pro+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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 10196 bytes
SHA-256: 616c2bb83e9b7d1d6a71699679b3285e522f41a1fd76f5e7149d3cfd70f436a9
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 19140 bytes
SHA-256: 990cc7d4be07697ea0291805c72a391434490422861808a628425497f76c0ccf
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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