Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33477c4a6eae373…

MALICIOUS

PDF

75.3 KB Created: 2021-05-28 04:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cbeebc8d47d1161f0fe23a744a29c21a SHA-1: d6e2aced8f7b62d8e7b4b565a0b47ab71fc24814 SHA-256: c33477c4a6eae3730e8eda0a6b5999882f8f1ee6c888839eb6b97175ccd432a5
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern appears to be a link farm designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=maxima+transferencia+de+potencia+en+ac In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_6018e15c55497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_604639801ac08.pdfIn PDF document text
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/8b1c368d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_60567277404c4.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/3188196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_6006e205721c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_6038567bd604d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df97f680-aff4-43ad-a52f-8bb3672da0dd/how_can_i_cancel_pureflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c4778b-8696-49b8-a02f-30ed5e3d8e3b/hoover_floormate_deluxe_fh40160_brushes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71f54c1-3cb6-44e9-b667-b01a956d07c0/whatever_tickles_your_pickle_sayings_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9793746b-93fc-47bf-9b29-dd9d600dfc39/wawirazukozijimopon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e1cbc2-9ed0-4a04-8bd0-fa22dde24318/heat_and_mass_transfer_data_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef45152c-a92d-49b0-8e14-c482ef4080fe/cambridge_primary_progression_test_science_stage_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f283a4-4788-49ba-9678-db2d5b03033d/zugekomijudup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca1d04f-dfcc-4396-a9c7-5df9be6f1fa7/49173305058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc4bb61-731c-4352-bb69-815c02655e83/rinnai_r53_tankless_water_heater_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9e3c12-27c7-43ee-9954-cbb7c0b13d4f/91797267399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de66739f-bdb1-4ee7-b82f-778445e3fe75/the_definition_of_public_relations_officer.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 5340 bytes
SHA-256: ba5aaf1f194f3d4d23154d3941c40f9780a48c07ae5527d2319d2cd8c8690b69
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 12100 bytes
SHA-256: 2d1548389f08f5627b0ba2f9bf061d5b0bfb8026ff17b23817387017e76d4a73

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