Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc137da52302a41…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 16:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9c635d77b27fe2a0aa5b5406f48c4602 SHA-1: 9dd28430bd9ee3759bae87218cf189a1e2628e04 SHA-256: efc137da52302a41454faaee3cfb7551cf66105af88efc5fb2ad88a43022fecc
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'golowaki.ru' and 'jevafurevozu.mygamesonline.org'. Heuristics indicate that the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan distribution lure.

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://golowaki.ru/strik?utm_term=how+to+test+your+time+management+skills PDF link annotation
    • http://jevafurevozu.mygamesonline.org/dopubometun.pdfIn PDF document text
    • http://intekzafast.online/23592646881wsypi.pdfIn PDF document text
    • http://contact-git.top/thirteen_reasons_why_season_2_episode_5a23h2.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/dghdGgi/33433102680.pdfIn PDF document text
    • http://rentline.pro/attached_amir_levine_download5xd4b.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/jcrbiaV/37949273398.pdfIn PDF document text
    • http://kernig.store/aws_certified_solutions_architect_official_study_guide_download2gcds.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/hnoY2pj/dynamic_parameters_in_crystal_reports.pdfIn PDF document text
    • http://vilajesakere.iblogger.org/how_much_does_it_cost_to_fix_a_cracked_apple_computer_screen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajapelemazibog.rf.gd/ai_factory_apk.pdfIn PDF document text
    • http://fulovefodib.epizy.com/20449875544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7dea707-6f2a-4801-a781-371664938272/kedisujalenusolanawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7cbec3-5856-466a-99d6-3b63d7f8aa17/gas_dynamics_james_john.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893b6f30-8430-4c69-9583-4aaeee06a344/o_que_significa_direitos_e_deveres.pdfIn PDF document text
    • http://pejefovad.epizy.com/34011335267.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/kepubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad8b35c-fbf6-46e9-ad68-4edd4195749b/google_search_image_resolution.pdfIn PDF document text
    • http://savefativiluz.epizy.com/menofisimekilunu.pdfIn PDF document text
    • http://voxafizuvukulam.epizy.com/codycross_answers_group_17_puzzle_2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 5224 bytes
SHA-256: 50a8f188a1121977f01372e5bc62ebb3e5399c0515a8d68ba965ffe47f6219f7
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11008 bytes
SHA-256: f46fbee20fd8cdd99a3c45cccfb46aee116e433a1879e60ce0bd6790ce0fc0dd

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