Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b00535b14448b2…

MALICIOUS

PDF

89.6 KB Created: 2020-11-24 11:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 88aa2075f524435604d0c41414c2f6b6 SHA-1: 15d5785d5b15a8a4f1ddd5938ecdb1ab3c45fa77 SHA-256: 81b00535b14448b2a05bea200e1966f4ff4ad55a14e1772215439ffb6bf1cb40
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, particularly the one pointing to 'cctraff.ru', suggest a phishing or malware distribution attempt. The presence of numerous external PDF links further supports the idea of a link farm designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=cecrops+the+lost+mariner In PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/xutef_dikak_kobinakafowumi_tivaguxulep.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gametuzumax.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/27cb22c1b3a.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/509088.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/caa18e93-663d-48af-b4a7-129dc109d68d/www_funcionjudicial_gob_ec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59e72fb-9677-47cf-8e47-0b780bd42530/electrical_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade4b5dd-360c-4de4-8431-5477236fcc39/mynet_mzik_indirme_program_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313d55f8-e7e2-47b9-8dc9-4b11ae70ab4f/house_of_fun_free_coins_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40b0bf0-42d0-4d2c-bae7-41745b56c26b/86679566366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8d2236-11d6-45b8-9810-6808f6e070a7/nupotap.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/excel_search_all_sheets_for_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e28ee29-1100-47ae-87d2-3e02ac19d5ac/tavomaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/google_sheets_count_if_partial_match.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26f3efa-08b0-40ef-8158-ad0a31aecefd/kirogubevikuravaba.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_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 5076 bytes
SHA-256: 365bcffc1ddb728c845ba6926a2fc1a2f82dc8c946ac06732dbcec1296aaa8ed
font_01_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 11232 bytes
SHA-256: f1727ddb2361c8ef30619f9963e1bfb27b6ee30cd6539618373c4728dd35a0f5

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