Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5f0148d1edefd0…

MALICIOUS

PDF

72.7 KB Created: 2021-03-11 17:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d7dedf55cea25bb39f3c3046d729187 SHA-1: 88e7da34b2aa6637632794690907c538b87dd3ae SHA-256: 3c5f0148d1edefd079283d647d92ed00c819578afd869eb985c5ea7fb47265b7
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The document body, though partially obfuscated, contains text related to 'Esquizofrenia paranoide definicion pdf', suggesting a lure for users searching for this term. The embedded links, particularly http://rosutob.getenjoyment.net/28399334208.pdf, indicate a link farm or SEO spam tactic, likely leading to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=esquizofrenia+paranoide+definicion+pdf In PDF document text
    • http://rosutob.getenjoyment.net/28399334208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407780/normal_5ff8020ce6d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_60274d46e87c6.pdfIn PDF document text
    • http://bazezirovif.iblogger.org/nra_shooting_range_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6038b561d1f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ff36fb5ad600.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/xapota/visualforce_email_templates_in_salesforce.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_aaeb3679088c4c3d855ce00cea284891.pdf?index=trueIn PDF document text
    • http://jexaziled.rf.gd/falciform_ligament_definition_in_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/information_technology_services-_japan.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/old_bollywood_movies_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/vancomycin_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/wenulogozuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/19090654598.pdfIn PDF document text
    • http://tumaxokalabad.epizy.com/when_do_hillsborough_county_schools_get_report_cards.pdfIn PDF document text
    • http://gakuzefesax.rf.gd/the_gerstein_report_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/71495476893.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_a64cabae50334ede9d6d4a86f36fa530.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/77421820933.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/numerologia_y_cabala.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2135f8df7f08408681a745058dae93ed.pdf?index=trueIn 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 5248 bytes
SHA-256: c91b252435b459049d4ad5de91712b17ca73c04759984f3b0f0399544896b6b1
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 9864 bytes
SHA-256: 651c7269b539d1325a74aeb7ceab8240298201fa3d4a6e5bc0c188d99ff53e6f

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