Malicious PDF — malware analysis report

Static analysis result for SHA-256 152de4d3b08e8a00…

MALICIOUS

PDF

87.3 KB Created: 2021-03-22 12:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a87c09fc3c41cc72a50aa49c7a3c305 SHA-1: 22410049dd5f10ecaff0d84fa16f244698870bd1 SHA-256: 152de4d3b08e8a004f1d92d07af07c5334d0201b3e7d45eee74bae065c9f1bbd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain that appears to be part of a link farm for SEO manipulation. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing or trojan variant. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity within a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/wix?keyword=norman+cousins+laughter+is+the+best+medicine
    • http://bukupiduge.mypressonline.com/dogberry_much_ado_about_nothing_character_analysis.pdf
    • http://fibipowokogo.sportsontheweb.net/quran_urdu_translation_app_download.pdf
    • http://juwaniwabi.medianewsonline.com/what_is_the_average_salary_for_a_cyber_security_engineer.pdf
    • http://forovasax.medianewsonline.com/acuerdo_final_de_paz_colombia.pdf
    • http://wiwovurezibaso.getenjoyment.net/decreto_1080_de_2020_archivo_general_de_la_nacion.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/ninazarila/47619911351.pdf
    • https://s3.amazonaws.com/webipejonavuv/belgrade_map.pdf
    • https://s3.amazonaws.com/wulagisi/avs_video_editor_windows_7_free.pdf
    • https://uploads.strikinglycdn.com/files/b9a724d2-d0cf-4fbb-a8f1-9446ea8afd82/momitofexapenidativ.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_ab2d2b691a7144028b20ec610c718c12.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_2fde2e251f204405ba4fcdf68f1111ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/afa3550c-2d58-4f00-bb5d-a0ef15b1f823/fozegosimavojosoxiruvil.pdf
    • https://uploads.strikinglycdn.com/files/ab0e87da-b7e0-4c33-9f15-905bb1bcc7e6/50496501237.pdf
    • http://wulibazosuxib.onlinewebshop.net/bosnia_genocide_case.pdf
    • https://s3.amazonaws.com/senodiw/boy_in_striped_pajamas_cast.pdf
    • https://s3.amazonaws.com/bejideba/air_brakes_cdl_test.pdf
    • https://uploads.strikinglycdn.com/files/efd9073a-77d2-47cf-9a7d-dad3a6a1e24d/does_burger_king_have_a_2_for_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f0.bin
0aceebd04ea51886a26817bc4361294e23f7bd562aca40e88471ab15f0318180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 5344 bytes
font_01_sfnt_off00011bde.bin
05728bc872723f09275d2eb10f0ce3fff9f704908db5c7c1c8b0192a2317fdf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 11376 bytes
font_02_sfnt_off000141ed.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 4324 bytes

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