Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dda388980a6121…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 21:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2bdb9b267ed4ea626d8427ec66a4be6 SHA-1: 599d236624a23deb039665191941287ee2c6d4aa SHA-256: c3dda388980a6121bc419f882341a7f087c61e7e824ea23fa4c1fb93a3916c22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://nyett.hk/uploads/news/files/42027729582.pdf In PDF document text
    • https://medsplus.us/admin/images/file/17818764878.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/xitikejosubadixaxa.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • https://norservis.com/files/files/58860667605.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/25295265024.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zefedebubusir.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fafanibinigusadisajuguxol.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/39292811125.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/72426995730.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/zavizubedapol.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/87050002967.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/ledazezipevivir.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/1483720363.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mubinutedajebogepol.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/welawagoselur.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42d11c6---83322912467.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/42410452061.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/23572382549.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109041324555594.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vuzewu.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/novonujogogakugezu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909042440.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/81253137239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=como+quitar+icono+de+audifonos+en+androidPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 10868 bytes
SHA-256: ef6fb5e9c0ca9744aef49103e53f2d0638c52f020fc531738299e67bc6074821
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 19272 bytes
SHA-256: 33f5e919dce068573d257d4150abfc951db1bb9f0263588189c7aa9acd7239e7
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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