Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbaa2ec00f44989…

MALICIOUS

PDF

83.2 KB Created: 2021-01-29 08:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26e1e7be78e36243f3671b56f6576157 SHA-1: bf90d58dbaf16612395f27c86ef0c861f1281d83 SHA-256: 2dbaa2ec00f44989218d881cdf0533286ee63164ea1d826f52029424e6b7e044
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector pattern, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=trackball%20mouse%20with%20scroll%20wheel In PDF document text
    • http://maykistore.ru/fonedog_toolkit_apk_downloadp726e.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/TBhuggF/rezidamunada.pdfIn PDF document text
    • http://copyright-help-center.com/76672750513qufps.pdfIn PDF document text
    • http://itravelimpressions.com/solar_system_for_kids-_colouring_pagespk2aq.pdfIn PDF document text
    • http://triple-doska6.club/55636484146ghydo.pdfIn PDF document text
    • http://fullhp.info/english_stories_to_read_for_children_sgmta7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fe823d343f66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_5fef013394624.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/jaShdJS/tafl_board_game_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_600c4ff34341f.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/9YicnGt/pagikamefubikeleboreva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484365/normal_5fe5451665f7a.pdfIn PDF document text
    • http://thefortykuti.com/wipebadowewabuvppfuj.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/dYhhVif/marorejureramuxiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fc710408c8e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_60028d210bce7.pdfIn PDF document text
    • http://italylife.pro/lesotagowewaxabqqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5fd8970a26e65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcf30a5bc7b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 5284 bytes
SHA-256: 0bc688aec99555c2294f620da907e5986e0757b076eec161a544c2dea17775d9
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 13268 bytes
SHA-256: 326560598c717acf514843c6e511555cd48288917689234662153053c48098b4

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