Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b8f0b5a92c8e5…

MALICIOUS

PDF

71.7 KB Created: 2021-02-20 01:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 836276345695b23ee72722aa98490439 SHA-1: 023ef6f7e46d891398d87246c0fa42e3450af958 SHA-256: f42b8f0b5a92c8e550c5ab6eac280089f47465a64f8dcfef88579056591ade88
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 URL leading to a malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'net force practice problems worksheet answers', aiming to trick users into visiting the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=net+force+practice+problems+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/suwuwewazaka/ghhaPid/break_time_cartoon_picture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5ff0317641801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6016f08683dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/hjViapv/the_girl_in_the_window_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fc80efe2f85b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5ff355eeddff6.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/Ahgxfac/96463867582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/busuu_arabic_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/newutoxuragenexesizokip.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/bakaxexixulewud.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/5091522542.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/cartoon_network_flash_games_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/dubai_visa_application_form_for_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/mock_exams_2019_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/lalodolagizovupabub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 5308 bytes
SHA-256: c70cfbe77a9934d288aa36c4603466c211afa99c93edd672d2ddeeb5826aeffb
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10136 bytes
SHA-256: d9b233e604744429878a685d86227c11a98bfdec21656d4d2263728ba82112a4
font_02_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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