Malicious PDF — malware analysis report

Static analysis result for SHA-256 837058ebbb6a4822…

MALICIOUS

PDF

78.9 KB Created: 2021-03-26 08:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79d265ae1cecfdf5db102c6134a56edd SHA-1: a70b2b81ab0f56cf45e43c48886eda257586a69c SHA-256: 837058ebbb6a48220a047d6758497d2ec1ae9d84be71ea59aae89c9601776f4a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attempt, likely to deliver a secondary payload or lead to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=benedetto+cotrugli+pdf In PDF document text
    • https://cdn.sqhk.co/kawinojos/jfCchjP/evacuation_map_oregon_fires_2020.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/how_to_reset_sharp_tv_password.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/83084099621.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuduwedimu/iibqjac/dixie_d_amelio_song_lyrics_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hbTgf8w/nozudofi.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/fZMxhgQ/pazarumebulubow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/jonug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd0d141-3105-4a51-8705-a73ccad13f0f/what_is_the_salary_of_an_ethical_hacker.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/77109365405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0994a706-df91-497c-abf6-84e338048846/what_is_ap_human_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/new_telugu_christian_devotional_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a613d701-f818-4723-84af-c4919e213231/60803572710.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/zidenitinuxagub.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/76097029829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87c6152-6ef0-4fd0-8bd6-9bc108f2d6e7/how_to_use_a_kitchenaid_convection_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7df3868-cdc4-4be4-b617-17413b31a2e9/best_quality_32_inch_tv_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b67ff2-56e4-4b5b-97b4-20a089e18e04/can_you_work_as_a_programmer_from_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e235203e-7f7b-4714-91b5-e86a8b0761b1/matlab_plot_point_cloud_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/zesudawal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aebfe39-5465-4d89-8452-ba344e0a0013/what_is_stephen_king_net_worth.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/andhra_pradesh_reorganisation_act_2020_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68585384-f720-4a52-8cb0-ef684cfcc283/67309112816.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 4984 bytes
SHA-256: 2a1c94217cb59fb4b0c69a44d1ee59f03b155074e4b38ac97fa30ee91505121b
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 13236 bytes
SHA-256: 287f0f0e2981ae11e87b8d290444063b58877b6dced7892f9fc1b42d4e232008

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