Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67646b676e59467…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 02:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4fd8c9824c973df4cab9ac25a2889a55 SHA-1: 8b185bf8c3499b10aa0bfa7f0935ab80ab3f4f35 SHA-256: c67646b676e594670c0f74490722b72dbff9ae35e688f15cd03fa2aa7fcbb494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host a large number of phishing or malware distribution links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://philabc.ru/uplcv?utm_term=justice+league+full+movie+download PDF link annotation
    • https://cribpointonline.org/cribpointonline/userimages/file/lufuwunemexofefokil.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/21855787774.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nn5jq1q9ldqfccq9f9i22kkiqu/97912161944.pdfIn PDF document text
    • https://sambelteri.com/contents/files/66677634274.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148fc570f9fb---39970404713.pdfIn PDF document text
    • http://aprt1day.ru/file/tifob.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/39931200369.pdfIn PDF document text
    • https://cristalensi.com/public/File/dagebefiri.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/basujefupubogavumi.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/81447171320.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zojivemobugabi.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/42132609784.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/mojejojupepu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/38756100743.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/rijokegobe.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/67467066647.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/meruxidop.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_off0000aa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9B 14848 bytes
SHA-256: 3fa7754d38745393e07bec9e292342b7002c5b0bd0c1045802a26804977948e0
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10960 bytes
SHA-256: e3f07ceabfd0e9983d1ba27761dbb7f246f42ad15678e7ad14538aa68aff949f
font_02_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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