Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00b3e7a1a07b13e…

MALICIOUS

PDF

101.5 KB Created: 2021-03-20 21:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35037d29f9bf5ce683c60a8dbe1f8b5 SHA-1: 8a3ebf4ad1288139f51743dd5c0602826ff41ebe SHA-256: b00b3e7a1a07b13ecd6babe2246abed2ed071d741872d8dc6ab8f3c048c9a9f3
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary IOC is the external URI used for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=neumonia+atipica+pediatria+pdf+2017
    • https://static.s123-cdn-static.com/uploads/4469119/normal_60019e3109877.pdf
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5fdd77ffc9009.pdf
    • https://cdn.sqhk.co/gabadifofibo/hgfecjg/fake_girl_voice_call_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ff5ab679643b.pdf
    • https://cdn.sqhk.co/vefutifeves/guigjgK/92819845502.pdf
    • https://cdn.sqhk.co/mujipumelebe/iiid9Mx/17619460197.pdf
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fda629673bd9.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fd9039dabb7f.pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_600e5dd74180c.pdf
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fcca9e79b6e2.pdf
    • http://vorugakolijek.22web.org/noleposoroxuxukidelemasu.pdf
    • https://cdn.sqhk.co/fukonovum/fmifwIe/contacts_order_online_cheap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_3c2cb243ed514a89bf27ceac3a3ec6d9.pdf?index=true
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_60e7dae409194390b0c2363d11950783.pdf?index=true
    • http://vulebirawesajo.rf.gd/good_english_grammar_book_free.pdf
    • https://uploads.strikinglycdn.com/files/bf7968b0-e060-400b-8698-ce824dbd781b/how_to_increase_manager_skills_in_pes_2020.pdf
    • http://mepivew.epizy.com/calling_in_sick_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/bfe6ab65-07cb-4d92-b536-77a3b012a902/harrisons_manual_of_medicine_20th_edition_ebook.pdf
    • https://uploads.strikinglycdn.com/files/44095064-5936-4827-be5f-72ea1cf7ce85/zaxedixazuxojodozifiz.pdf
    • https://uploads.strikinglycdn.com/files/edbb34fe-d73a-4cc9-9419-337caeb5f911/how_to_work_a_dressmaker_sewing_machine_mini.pdf
    • https://uploads.strikinglycdn.com/files/2b894d55-31a3-42a6-8282-bf7950c27331/zitipawofigojosifujasar.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_off00014d19.bin
05b8b65cdc53888074c5f9bde631fa967a471a2ba8b41a12277dfd6bb3a4f3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 5464 bytes
font_01_sfnt_off00015faa.bin
d1b947c5149f1e2ddb6346fe7f5d3e05bf13b336ca10d4b6275d1d20056c44f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAA 12072 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.