Malicious PDF — malware analysis report

Static analysis result for SHA-256 c367f0787a44e457…

MALICIOUS

PDF

79.1 KB Created: 2021-06-06 08:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e6ade40ec4315bf1e3ad99df0d19205c SHA-1: 3e71542b244195f39990ee6546687c4fb63dbdfe SHA-256: c367f0787a44e4571ed4a313801ca260aba07c17bd416bb1603fd7ce1dedef9b
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'laborke.ru', which is likely a malicious domain used to host a secondary payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to a book title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=it%2527s+hard+to+find+a+good+man+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5ffa94149ce48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fec75c9e1d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_605da7385d2fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5fce179edae7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5ff57a71376d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_600c6eaf22620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5fe062e21e26e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ff7cc5a57091.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387230/normal_60b6af3c68433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_604a64b671644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_605f9620ed671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_605802c7e4697.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/826126c2-3483-4f1a-840f-60a97d91e647/lifetime_portable_basketball_system_52_inch.pdfIn PDF document text
    • http://muxapoxowo.pbworks.com/w/file/fetch/144645615/data_structures_and_algorithms_in_javascript_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237a53bb-0937-49f4-bb0b-480f1feae430/alpha_omega_elite_car_seat_cover_replacement.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144510684/virginia_satir_libro_nuevas_relaciones_humanas_en_el_nucleo_familiar.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/how_to_get_unlimited_diamonds_sniper_3d.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/f/what_is_the_symbolism_in_young_goodman_brown.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_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 5464 bytes
SHA-256: de403467ba909b6a25ee3e2671b715f4e6d01427ea3a37a48c1490762443cd35
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 11048 bytes
SHA-256: eb49a01d253ef6a61dbc7d7c22d764211b1b5df210b5b3185e3623c437996a8c

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