Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb923809abc3502…

MALICIOUS

PDF

81.5 KB Created: 2021-04-14 15:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af33130212b979ce4a22672519fee5e7 SHA-1: 4558c5a3063f074d30b85471868ea8ce3908d663 SHA-256: 5eb923809abc3502f6ae790a018b4087d5954cf7068c283d37f6e1b03ffac9f6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=omron+fat+loss+monitor+accuracy+reddit'. The document body, though heavily obfuscated, contains text related to the URL's query parameter, suggesting a phishing or scam lure. The ML classifier also strongly flagged this PDF as malicious.

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/strik?utm_term=omron+fat+loss+monitor+accuracy+reddit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5ff41a83a934e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_603bcfee2e22f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5fe70ecd5ced1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fdc21d534690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_601e4820a407b.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/figidireki/lg_front_load_washing_machine_leaking_from_door.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/sony_bdv-e3100_remote_control_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/education_board_result_2019_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/58123409291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf4503d-1d0e-4d6f-8428-1d6eebe385c4/43168426456.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/chemistry_o_level_notes_free.pdfIn PDF document text
    • http://mujunego.epizy.com/bunch_of_thoughts_in_tamil_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/ps2_emulators_for_android_phones.pdfIn PDF document text
    • http://bedigetulo.epizy.com/atharvashirsha_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb212d9-2709-414c-a7fb-07fa3fb4e588/how_not_to_be_a_doctor_and_other_essays.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/autobiography_comprehension_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203a2c69-043c-403a-b699-089fa681c539/como_montar_um_logotipo_de_uma_empresa.pdfIn PDF document text
    • http://fadevosozegula.epizy.com/atlanta_airport_terminal_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dba1f20-3b1c-4b86-bd7b-9a1082c5e2a8/mipimox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7441c6eb-4d75-4104-bf6b-ed33c68816e9/mizuj.pdfIn PDF document text
    • http://vasugam.rf.gd/durumawumabuf.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_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 5296 bytes
SHA-256: 4a73c4d48d9f0f08627734930d5e02b6482100430b218175fbeae93a6ea3ebb0
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 11784 bytes
SHA-256: 12f01537d0408a50cd4e7b463c4f9af15dd5dc563049d4a5b1b5414d6a2b62c2

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