Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ec9f777ce8e4cc…

MALICIOUS

PDF

74.2 KB Created: 2021-06-07 17:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1903f043b7ad1b53acf6d4a4a94a5da SHA-1: 057d50713149e56b073d9370d3fc5b37b9373906 SHA-256: c6ec9f777ce8e4cc7ada1d22d8d73a8f09a9a47e2e321224604025ea4bf7c63b
126 Risk Score

Malware Insights

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

The PDF contains a prominent link related to faking an IELTS certificate, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external URIs and the nature of the lure suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pistant.ru/pbw?utm_term=how+to+fake+ielts+certificate
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/medemozewifove.pdf
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/8577200.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nigezid.pbworks.com/f/how_to_add_excel_analysis_toolpak.pdf
    • http://tovovojufa.pbworks.com/w/file/fetch/144669783/human_physiology_from_cells_to_systems_oleh_lauralee_sherwood_8th_edition.pdf
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144562656/bala_tripura_sundari_moola_mantra_in_kannada.pdf
    • https://uploads.strikinglycdn.com/files/2ca0b326-c3df-4ab2-b377-e229469743e8/staff_refusing_to_wear_a_mask.pdf
    • http://venatulafiz.pbworks.com/f/is_carbon_dioxide_an_ionic_or_covalent_bond.pdf
    • https://uploads.strikinglycdn.com/files/f6018033-7b63-4ba9-bd70-3210ad3c750d/redemption_manual_4.5_free_download.pdf
    • http://kapetipubi.pbworks.com/f/hack_simcity_buildit_ios_without_jailbreak.pdf
    • http://fepewuwakow.pbworks.com/f/jabokoxufepowafonetifakaj.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144427125/akn_dil_exclusive_kitap.pdf
    • https://uploads.strikinglycdn.com/files/b9d5c1af-7ff7-4c51-b5f3-f39de8ba366e/55536774618.pdf
    • http://redelaw.pbworks.com/f/neo_bomberman_para_android.pdf
    • http://gogoporiwo.pbworks.com/f/tuvidanagerason.pdf
    • http://lojefizowoj.pbworks.com/f/46943912005.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412137/how_to_install_bodyslide_fallout_4_vortex.pdf
    • http://sojakun.pbworks.com/f/23810591387.pdf
    • http://mokapuv.pbworks.com/w/file/fetch/144654549/half_wave_and_full_wave_rectification_with_filter.pdf
    • https://uploads.strikinglycdn.com/files/8b177fb5-fe4d-4d9e-831e-d440509e3034/angularjs_interview_questions_and_answers_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e563.bin
70c0b52d568cfcc04d16dd85a5a74a1826a7dbb810892d6d1fa17734b61dac72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 4992 bytes
font_01_sfnt_off0000f685.bin
c1ab51cc6b4f0e56a095110a662a90921fa00261225627905bf64317b3c99b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10652 bytes

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