Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e589038c2d01bcb…

MALICIOUS

PDF

82.1 KB Created: 2021-04-23 01:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefb21edfcd920ab44a702fb2dcf62e4 SHA-1: d1641f44f4839931bf077ea24dea071fcd4f45e9 SHA-256: 4e589038c2d01bcb0a700cdc5326fbed5a50e3a562ba64ca6a16d734321baef8
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'Briggs and Stratton Intek 190 parts manual'. No scripts were extracted, but the presence of external URLs and the nature of the detection suggest it's a phishing document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=briggs+and+stratton+intek+190+parts+manual
    • http://teachost.com/gold_cash_personal_loan_appjtywi.pdf
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fe66c7b87ace.pdf
    • http://avtoshkola-region26.ru/voltaire_candide_magyarm6ka2.pdf
    • https://cdn-cms.f-static.net/uploads/4458854/normal_601b4edbafe0d.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_601f8f739a18c.pdf
    • https://cdn-cms.f-static.net/uploads/4408330/normal_606adc53708d7.pdf
    • https://cdn-cms.f-static.net/uploads/4428045/normal_601cc1e667a38.pdf
    • http://newyearshop.site/what_are_four_nitrogen_bases_in_dnabywy4.pdf
    • https://cdn-cms.f-static.net/uploads/4377697/normal_602a28fad884d.pdf
    • http://regvoolkim.website/mezcal_con_botella_en_forma_de_gusanoq4vhw.pdf
    • https://static.s123-cdn-static.com/uploads/4475570/normal_60077cc6c97bc.pdf
    • http://drilltech.info/organizational_chart_template_google_docswizcl.pdf
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffbec9d5ef9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb987466-6f57-4da8-b9b1-a3c70c1c50bc/72696643972.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_8b008ef653ee43879b09be4d941ed892.pdf?index=true
    • https://s3.amazonaws.com/xezonijida/ejercicio_aerobico_y_anaerobico.pdf
    • https://uploads.strikinglycdn.com/files/876f6371-bfc8-4a47-a15a-ba1cc3e85fcd/nurikuwax.pdf
    • https://s3.amazonaws.com/votubukaxogilix/lambada_sheet_music_guitar.pdf
    • https://uploads.strikinglycdn.com/files/bd6222ee-63c8-47cf-8f58-bccbe88ac7e7/10952099493.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_682cc514b8194808a2d811ed49f3082f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfcd7662-58fe-4a67-9def-fb7305c0bc18/weber_spirit_grill_cover_e210.pdf
    • https://uploads.strikinglycdn.com/files/30f8e319-58d0-4c19-baac-f5ac26206469/73835130648.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_fc34bf066fef401484fac9051f2e79c7.pdf?index=true
    • 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_off00010104.bin
c62a1491bd09d18d2fa7b16d87d73988ad1fed590f2856b1058dec862ef52d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 5744 bytes
font_01_sfnt_off0001147b.bin
8648476c32b05dc1996bcd6fc402f0fb7cbeea8ad55cc8bda8b2007db14a39c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 11112 bytes

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