Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab60c29cac08c54…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 05:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b219225420cb5ae78d1fcb8bee2f247b SHA-1: b65de927b422688d8c51ce2750554de33cfa12eb SHA-256: fab60c29cac08c54ff7c9d072ae99361e755ec0c3ab0b7acd52c6902718d564f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains an embedded URI pointing to 'maypoin.ru', which is identified as part of a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

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
  • 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://maypoin.ru/award?keyword=basic+arabic+words+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6021e926930fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd27b8b95d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_603bb6301c6b7.pdfIn PDF document text
    • http://cabinetshq.xyz/busizorejosivetulaqdqne.pdfIn PDF document text
    • http://lumasilove.iblogger.org/how_to_make_a_gas_golf_cart_quieter.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/decision_tree_analysis_in_excel28uy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5ff0e5decaadb.pdfIn PDF document text
    • http://sexesex.site/zelanuxadavegumedozu3okq.pdfIn PDF document text
    • http://brettlockhart.com/2126271106510e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_602ad1156b673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_6013b203ecd47.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/8cc6eeec-b01f-4368-9849-33d6d7663864/dyson_cinetic_big_ball_animal_allergy_upright_vacuum_nickel_refurbished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f56a18-2494-4cdf-ac2d-bc6198a2e830/70847557149.pdfIn PDF document text
    • http://timotixuk.rf.gd/passagens_walter_benjamin.pdfIn PDF document text
    • http://lojetejimekatow.rf.gd/80021659004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a0941c-ec98-49c3-a0a2-c28bc0b12706/solicitud_de_novio.pdfIn PDF document text
    • http://vovivufevalo.rf.gd/novemuxi.pdfIn PDF document text
    • http://zonurupadul.atwebpages.com/the_analysis_of_panel_data_under_a_markov_assumption.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/jaxosu.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5700 bytes
SHA-256: e505105cfe40280364295817bbbb9c6bc7b2526234ef5abdf8f0c6ef6d0c30d4
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10720 bytes
SHA-256: b38788e13e701ae290e8416c7a096b9a6d8a1c12faf149957433cad9305da2ea

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