Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75cfcad8d5abfb4…

MALICIOUS

PDF

97.0 KB Created: 2021-05-22 22:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 724fd5136eb69d944a84b0c0d3be8e14 SHA-1: 543d54498b56138e565a854277e2564cde8de2d4 SHA-256: e75cfcad8d5abfb4792ae6535ecd46fd94bda4073e3620a22136777b74ec414f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The primary URL, 'https://soxebez.ru/strik', is likely the destination for the malicious payload or phishing attempt. ClamAV and ML heuristics confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=binomial+distribution+mean+and+variance+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493200/normal_6036fe3736a53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fc8d0ba81b5a.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/1307465.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/6557783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5fd8fd88a1816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60511424830bd.pdfIn PDF document text
    • https://bofubesal.weebly.com/uploads/1/3/5/9/135958810/sedir.pdfIn PDF document text
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/47538.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/sizimokaxo.pdfIn PDF document text
    • https://nenawobu.weebly.com/uploads/1/3/4/1/134131353/lumewefotuvitikifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_6042b71bbde22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_606decf2cb867.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://uploads.strikinglycdn.com/files/9f6a5f5c-6397-42e8-831f-2dc645e1b981/68449938868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e54c8a-8533-43b4-aa03-2132a07cb2f5/p90x_legs_and_back_workout_calories_burned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756a7f8b-1fab-4156-93e6-5704b8d3665e/sumogojufivixuvifawal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c30c0e7-91b6-442a-85cd-913934ac68f7/76122687795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d57e78-1a12-476e-aa64-feea67c5b8cf/teaching_english_as_a_foreign_language_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a016a9c-b5c3-4ffd-9eaf-fb37aae6ce9c/basic_lab_skills_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d503f35f-3f1f-4fa2-8410-a7225603821a/how_to_on_lenovo_keyboard_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b62fff-de89-41a0-a07e-830024ab2c3d/how_to_reset_waste_ink_pad_counter_epson_l120.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 5432 bytes
SHA-256: ed30924f9611a30ccf96dbbd8b574775762dd522c86dababc85366d0e8578b97
font_01_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 13360 bytes
SHA-256: f89381d0bf2d5af7325520f3117bfb8e441b3cccc8e88e95aa78364372c05b60
font_02_sfnt_off00015277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15277 16368 bytes
SHA-256: 22b83e669e75f08244cfcc69d5f27773460ce6281b27b748ea7e4dacea74bcbd
font_03_sfnt_off0001687d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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