Malicious PDF — malware analysis report

Static analysis result for SHA-256 766856d8f37f3890…

MALICIOUS

PDF

678.4 KB Created: 2021-04-23 10:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddbf999c4b03aee12a34fb4e39f5f5f4 SHA-1: a2de1ee72a1985c23e556f8828bbd247457f653f SHA-256: 766856d8f37f38909322c6e90f8004bd1e3ac08cdc67aa6fd519340f16a53b0a
136 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The presence of external URIs and the overall detection suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6755

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://kuzutuzo.ru/strik?utm_term=peter+elbow+writing+without+teachers+summary PDF link annotation
    • https://cdn.sqhk.co/pojimisuso/hfuCijx/cosmo_run_2019_milano.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/PihHRhf/alarm_clock_app_that_plays_music_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/hifhbid/learn_python_offline_tutorial_and_interpreter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/gcaegxB/55459426657.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/Szvq2ha/quilted_christmas_table_runners_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/hjjg12Y/bicep_curls_best_form.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/mie7hjn/mosuvoxoma.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/bgcjcIR/corporate_governance_guidelines_malaysia.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/gasalikuviz/hdKJijr/panera_bread_boxed_lunch_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/gaduwifawide/giicjh6/tapis.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/V49dbJQ/74776892254.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/1W1OYRv/local_lounges_in_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/if4f2hg/word_link_to_previous_greyed_out.pdfIn PDF document text
    • https://cdn.sqhk.co/fejumoraw/hgjhdVQ/mamoxuzupiwevakak.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/phfSxxk/82440755847.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/KFhbhiB/jepidiseduwonutexuzutukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/jgu9ohd/16105582737.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/mie7hjn/mosIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/masevewi/what_are_good_yacht_names.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/reading_comprehension_exercises_with_answers_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/anormalidad_y_normalidad.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/pozimolapetaxomatego.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/laveradetizofixitibuvezut.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/19126250142.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/2747956630.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/boy_scout_christmas_trees_vancouver_wa.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_off000a4670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4670 5548 bytes
SHA-256: 5b062d794eb028b5060fdbccb0665536f10f2ebe514f820a0e60dc69293ae21c
font_01_sfnt_off000a5946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5946 13356 bytes
SHA-256: c5ceeb94560f0047f21db86824fa0d6e488fd038ee21e0c24e702461b53c0bea

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