Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6a6d05e756badb…

MALICIOUS

PDF

83.0 KB Created: 2021-04-02 18:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f7651c740cbd77e417e5246e08aba434 SHA-1: 6829c20c93410a4ef051a2009538f7061fb480f6 SHA-256: ea6a6d05e756badb4cab8d520da10b8b0bdeaab002ea72649e8f19fcc8dc96aa
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to search terms and applications, suggesting a lure to external content. No scripts were extracted, but the PDF structure and URI findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=eurydice+jean+anouilh+pdf PDF link annotation
    • http://waxinexedodupij.22web.org/armas_de_la_primera_guerra_mundial.pdfIn PDF document text
    • http://vienvozvrat.site/daycare_assistance_ny_income_guidelines7276d.pdfIn PDF document text
    • http://shtangye.xyz/used_naa_ford_tractor_parts_on_ebay0qc9h.pdfIn PDF document text
    • http://maykistore.ru/simple_past_exercises_intermediate5kk12.pdfIn PDF document text
    • http://swiss-gear-top.xyz/how_to_factory_reset_a_kindle_fire46n15.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/23521916922.pdfIn PDF document text
    • http://helpcopyright-service.com/444623243011hlr2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nibewisule.epizy.com/eclipse_remove_bookmark_shortcut.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_58c6f6876f4544fe929c8878f6cbb8d4.pdf?index=trueIn PDF document text
    • http://popovanepedi.epizy.com/92657512465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175831f0-1ec9-4328-a8d8-0b872e063428/anet_a8_3d_printer_driver.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_50f4ee327711408685f3ece16772d151.pdf?index=trueIn PDF document text
    • http://sowiriged.rf.gd/zifuwepud.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_b9690c1e6fcd45b0b2d0cd214f5a39b2.pdf?index=trueIn PDF document text
    • http://wupepiritepax.epizy.com/modern_chemistry_chapter_3_test_atoms_the_building_blocks_of_matter_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/fogogurenoxadupejole.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/how_to_reset_marantec_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1b72e6-1d4c-4678-9c18-309b46e04e26/python_programming_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/how_do_i_access_my_icloud_account_on_iphone.pdfIn PDF document text
    • http://mejefelutirarej.epizy.com/8175750087.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_b5c0af449fab4046848a5aa93a1950d1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 5004 bytes
SHA-256: 422063e59a92b13a27b925a7e92a9b1988200361d700ffab53aa2e6d74b74c60
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 12372 bytes
SHA-256: 3792158f292a5aba3598e5e6e86c912da47f21384ef7e05cb1264060ea535b88
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333