Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38a90b4b33901c2…

MALICIOUS

PDF

77.5 KB Created: 2021-04-11 14:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c5b8923bc8c77db3043ca9dc799e97 SHA-1: b7161247ebc7d1df70a5b21a048aa6e0ec0d0ea6 SHA-256: e38a90b4b33901c28932008229248f3fc7a3b2b457b98ca208bd47cdde73762f
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, identified by ClamAV and ML classifiers as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of external URIs indicates an attempt to redirect the user to a potentially harmful site for phishing or further exploitation.

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
  • 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://resalured.ru/strik?utm_term=is+there+neco+paper+today
    • http://ponaxamewimenul.sportsontheweb.net/o_que__cultura_popular_editora_brasiliense.pdf
    • http://copyright-central-media.com/definition_of_apothecary_in_to_kill_a_mockingbirdstnkw.pdf
    • http://lorubuxetorifa.medianewsonline.com/amigdalitis_bacteriana_tratamiento_antibiotico.pdf
    • http://suzupuwejal.mygamesonline.org/wevajekewukatunebegufu.pdf
    • https://cdn.sqhk.co/tutabalero/aiehhC1/ww2_eastern_front_medal.pdf
    • http://lomigakorak.getenjoyment.net/41587969672.pdf
    • http://avit0.cc/computer_course_fees_in_chennaiync4k.pdf
    • http://servempieza.site/world_economic_freedom_index_2019_india_rankpnms0.pdf
    • http://fofiwafajelerax.sportsontheweb.net/gawuwiresi.pdf
    • https://cdn.sqhk.co/feluxolid/Xhtgjla/our_bucket_list_notebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_20f9c9bbb9b1468a97637586af350875.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f059f0b-e982-4a9f-be9b-55cdf1d36dff/how_to_use_macro_recorder_in_excel_2013.pdf
    • https://uploads.strikinglycdn.com/files/71d203d0-ec74-44a5-acdd-b77ead03f396/how_to_replace_thermal_fuse_whirlpool_cabrio.pdf
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_fd106f1915da475e8ad54abfd2910a5c.pdf?index=true
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_59e57a56a40241078e30ef5bdbf361b7.pdf?index=true
    • http://wegamaluperetuj.atwebpages.com/33266522927.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_2ada232915c94cb5b024e1947986d098.pdf?index=true
    • http://xakagigoneliv.myartsonline.com/what_is_the_principle_of_patient_autonomy.pdf
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_19ca4795245c45e4a82a0e9ad5f62334.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36b59661-bc06-4a2b-90cc-fb8dec8c9852/how_to_adjust_redarc_brake_controller.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_off0000eef7.bin
dd1f0c2135ca522995ee6c67cd7662312f2e43b6fa50c0a66cfcab863efcb769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5168 bytes
font_01_sfnt_off0001008d.bin
4457053d19ad32d0ec9af9dd14a4c49fe7c7f3b63fa5e33b993a9cff52dd82ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 11488 bytes

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