Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bb1b102ecd93cb…

MALICIOUS

PDF

130.0 KB Created: 2021-04-06 05:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3bf9b39bf9aa3a517a3cf5fe624db48 SHA-1: 7e9c16ceaecb4e4edab5fe8e910ba2749f0d7d2a SHA-256: c6bb1b102ecd93cbb9ab9bda30549215b893252bf4e284608bd1df629aee9801
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'density problems worksheet'. The primary IOC is the external URI used to deliver the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wix?keyword=density+problems+worksheet+doc
    • https://nujodobenume.weebly.com/uploads/1/3/4/4/134441993/6780051.pdf
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fe24046ce084.pdf
    • http://nitesufi.sportsontheweb.net/gasuludufabez.pdf
    • https://static.s123-cdn-static.com/uploads/4443344/normal_5fd07e8c94bcb.pdf
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/3978878.pdf
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/8326a4f0ca7ddcf.pdf
    • http://xalapuzim.sportsontheweb.net/oracle_pl_sql_iterate_associative_array.pdf
    • https://jezisivakutuxek.weebly.com/uploads/1/3/4/8/134862078/960508.pdf
    • http://gafaneripebenu.iblogger.org/small_signer_un.pdf
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5fcae50a68fcf.pdf
    • https://cdn-cms.f-static.net/uploads/4374203/normal_60538caedb296.pdf
    • https://static.s123-cdn-static.com/uploads/4393632/normal_6006d47074aad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fd50315-12ef-464c-b005-ff46958f08ef/agile_method_vs_waterfall_method.pdf
    • https://s3.amazonaws.com/zuguvoxoki/dagititori.pdf
    • https://s3.amazonaws.com/dazawojob/ensayo_sobre_la_pelicula_el_seor_de_las_moscas.pdf
    • http://samajusinifako.atwebpages.com/chilam_balam_restaurante_barcelona.pdf
    • https://uploads.strikinglycdn.com/files/3a4ffa5f-aa40-499e-8fd3-dee0297141e9/jesuvunikutin.pdf
    • https://s3.amazonaws.com/nokiva/nature_s_answer_pueraria_mirifica_uk.pdf
    • http://rinaditinimi.epizy.com/ethernet_cable_colour_coding.pdf
    • https://uploads.strikinglycdn.com/files/806414db-8ece-4923-8466-76a593ca9a93/how_to_remove_a_volvo_penta_outdrive.pdf
    • http://kerexiref.onlinewebshop.net/safety_technician_job_description.pdf
    • https://s3.amazonaws.com/tesodagiwor/fluoro_guided_hip_injection_technique.pdf
    • http://tijuvewoduga.onlinewebshop.net/werodopowikiwo.pdf
    • https://s3.amazonaws.com/setaxilitozuko/wesodenugivogeres.pdf
    • https://uploads.strikinglycdn.com/files/72e1e369-f958-4177-92e0-8502bdbdc67b/zezorajetomopiv.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_off0001c024.bin
5eea753671eebffe639ba5f6902fae474bd6f941f2e7951cc4d727e3019209f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C024 5500 bytes
font_01_sfnt_off0001d2c3.bin
567191055c26cb0bbe1fab53014d0a5adb956b20225c7bb9a9769531b194120b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2C3 11172 bytes

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