Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd495d7753f7eb9…

MALICIOUS

PDF

77.5 KB Created: 2021-05-19 10:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b78e5ed973430b38323490a8a97de8d6 SHA-1: 9452c2426b4c95cd409111ee882d006596fec09c SHA-256: 2cd495d7753f7eb9b7f68691b28ccc2ffa4815801efde98f65514a1d2f31f9f3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and is identified by ClamAV as a phishing trojan. It contains numerous external links, with the primary malicious URL being https://vilenefex.ru/strik. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=2g+architecture+magazine+pdf PDF link annotation
    • https://gazavado.weebly.com/uploads/1/3/4/3/134331045/2504f8b6.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/9945344.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/9c96976b9b9b0.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/fbd7b2.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/zaxudevenekan_wivan_wusivuvifi_dijivifebe.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/wibulatelowoz.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/zapemeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8732f88d-76f3-4e20-bb6a-646475dd5a68/11473277373.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/manipiwurimilesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a9297d-6849-4211-888d-250522990575/remains_of_the_day_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad81c39-00c1-4405-b4c9-f62bc42d5bab/how_to_adjust_rainbird_5000_distance.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/veguxenolejiritot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3650ee1d-7039-4a8d-a8d6-eb3adf42c7ff/vovuwesalexet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946bd36d-b27d-4d67-ab18-5bf97e7107f8/21463577697.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/birthday_calendar_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/weather_report_north_hudson_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990f861d-184b-4a18-9c82-fe56c7d6b08a/7119912844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec16dfb-2ed7-4d3d-8994-cf76f1568a7f/global_marketing_in_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/why_is_my_hp_photosmart_7525_not_printing_black.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/dean_martin_sway_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72644e3-3eaa-4f1b-b92a-bd6c2a592898/what_is_the_other_name_of_sensory_neuron.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/urticaria_multiforme_pediatrics.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/xusobifod.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/management_information_system_l_g.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://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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 5448 bytes
SHA-256: c5a465ff45113674b9990fdd67b028ceeaead8a5a58092b25686273726eb67c0
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 11480 bytes
SHA-256: b00613b30439701c3d6f95fc1bcf97bd6073800f616cbd6dc127a376c3a23cdf
font_02_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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