Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76cfc45cb4aaf8d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 05:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2c7501b787261df8372bda3b44137d6 SHA-1: e3c95b28e73187d19bec7a2d2f9847c79b2c5126 SHA-256: d76cfc45cb4aaf8d0c94d9658d6a1ae62c6be84262cdce1b3c39428ad327d5da
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to zajinet.ru, suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document likely contains language designed to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=what+are+the+keurig+models PDF link annotation
    • http://vkysnaya-eda.site/can_i_use_a_rug_doctor_to_clean_upholsteryl32ad.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jf7jcje/kumopofewalamopijopavox.pdfIn PDF document text
    • http://matrixbicycles.com/motivational_speeches_about_lifequ10p.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/a7Xhhhg/learn_python_programming_youtube.pdfIn PDF document text
    • http://fewizoge.22web.org/annual_report_definition_management_discussion_and_analysis.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/ashrae_62._2_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/gdjfjgW/65653769529.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/diaper_genie_expressions_how_to_use4r6qk.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/dLhfRii/87196075149.pdfIn PDF document text
    • http://gisibumovemuv.22web.org/27517416346.pdfIn PDF document text
    • http://tryplafond.xyz/jokabuttivzk.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/playwriting_101_glossary.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/xbox_360_problem_z_zalogowaniem_do_xbox_live.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fe74396564ba.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/Vibjigi/f1_manager_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_600c201c79070.pdfIn PDF document text
    • http://file-id.ru/7567941707385ri7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezoxonu.epizy.com/pekerozatizivitipewufad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4dd94ef-41a8-480c-a897-974c39a3bac1/61421538214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc28507-2080-4db3-9e34-67e7b6e5d7a5/cloud_computing_career_salary.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/jikazififusutolabafifus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c98e5d-31f7-466b-a4c6-ad867669d0e5/uft_contract_retroactive_pay_schedule.pdfIn PDF document text
    • http://muwoxixogafopi.epizy.com/who_makes_ariens_ax_motors.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/harbor_breeze_ceiling_fans_installation_instructions.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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 5316 bytes
SHA-256: 1f1014c97c3cfd62cddddecb9616c3f8252dfd997a0ac0a30375baa0c56a6faa
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10996 bytes
SHA-256: 80572a03a7652ce24250980432337bf433a5e0f511880b605c9ac696cde3e658