Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15ebf4a387f7b0c…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938758dfdc47f10e5b6a047f020828ba SHA-1: 935037eb2424700f8947e6a3350209bf6a615338 SHA-256: d15ebf4a387f7b0ca64c48e7c1620a1cc700df266d41cc34124240bc8ac97333
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'kuzutuzo.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'treatment pdf' and the authoring application 'wkhtmltopdf', indicating it's likely a lure.

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://kuzutuzo.ru/award?keyword=balanite+traitement+pdf
    • http://woziwowariv.sportsontheweb.net/budapest_transportation_map.pdf
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60388e400abfe.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6017321f0a4b1.pdf
    • https://static.s123-cdn-static.com/uploads/4473432/normal_6000a47fa9900.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_600fd34e3ab0e.pdf
    • http://ginalupajeriw.scienceontheweb.net/kixot.pdf
    • http://zexedebamuwep.iblogger.org/2000_chevy_s10_service_engine_soon_light_reset.pdf
    • http://rinagojoja.22web.org/33120884568.pdf
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5ffe5070a6185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b1a468c7c3644909ad5d1aef880702a0.pdf?index=true
    • http://ximipine.epizy.com/56754763943.pdf
    • http://panekad.rf.gd/easy_crochet_infinity_scarf_patterns_for_beginners_free_uk.pdf
    • https://s3.amazonaws.com/zisulamisozoto/vipulipulusejopubibo.pdf
    • http://torifutipu.epizy.com/small_convert_to_ppt.pdf
    • https://s3.amazonaws.com/fadobirak/how_to_stack_a_frigidaire_washer_and_dryer.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_f55de9eb812848f99b043bb82e537089.pdf?index=true
    • http://zumaborelap.rf.gd/authentic_happiness_martin_seligman.pdf
    • http://gewekerob.epizy.com/how_to_use_microsoft_fuzzy_lookup_in_excel.pdf
    • http://sugorotebego.epizy.com/junegipefapigupeju.pdf
    • http://gotuwun.epizy.com/physics_books_for_jee_advanced.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ac.bin
9d3dcdd84b631b44ac5e783c038be516dc4a16c192f6b02c63494e60088f24de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 5056 bytes
font_01_sfnt_off000102c9.bin
46969bae328c64582cd59ade484297eb5b7692c4dfc4b6d7cbefb23f1ac6a1d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 13652 bytes