Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d9f2bb775a07cd…

MALICIOUS

PDF

81.4 KB Created: 2021-04-14 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9eb33e33073d773df6e5e4c2460dd02e SHA-1: 6114f0bd2614583d06dd346abceacc6908ba2c0c SHA-256: 33d9f2bb775a07cdab4aa068c14e44d49691028d5b613fc3be52be6e5611a20b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

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
  • 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://nipisod.ru/strik?utm_term=overhead+door+legacy+696cd%252Fb+limit+set PDF link annotation
    • http://sofebitaxed.iblogger.org/xurakipud.pdfIn PDF document text
    • http://zawisemuw.iblogger.org/adding_vectors_worksheet.pdfIn PDF document text
    • http://wirajamosilun.22web.org/top_5_bengali_movie_site.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_6064603e6c3ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6020fa6936570.pdfIn PDF document text
    • http://judafipixomet.iblogger.org/1019644933.pdfIn PDF document text
    • http://retalili.iblogger.org/66844895342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_601ef22e48922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_6056da799335e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_600514a6dd39e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://mafuwiwoxosom.rf.gd/bullet_force_apk_mod_money.pdfIn PDF document text
    • http://sobuzazan.rf.gd/aloha_browser_apkpure.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/60661146429.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/17457981879.pdfIn PDF document text
    • http://tapewiwesumufug.epizy.com/mis_marketing_information_system.pdfIn PDF document text
    • http://fepevakadiw.rf.gd/2014_jeep_patriot_manual_transmission_problems.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/ipl_2020_schedule_time_table_file_download.pdfIn PDF document text
    • http://voxinuxo.epizy.com/walefewedolamojasepadax.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 6028 bytes
SHA-256: 5b5d3a9acd87d75a5451100a38e54ae0703ec6927e31d2538eb018187870454f
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 6068 bytes
SHA-256: d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10812 bytes
SHA-256: 4e36d32448de6cbba7c15f685dcd8976fb44e15d47c3b1b0d215827e40de1757

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