Malicious PDF — malware analysis report

Static analysis result for SHA-256 c106d735e6e97049…

MALICIOUS

PDF

88.2 KB Created: 2021-03-21 00:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57f1e9317215b67b2f2745d42574dd3a SHA-1: f4dfce4ef57298fd74c6eef14222eef47a41c023 SHA-256: c106d735e6e970490ed1d9121045e51fd0c9fd9145211ef6f4f63fa4563c9c19
136 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. An external URI pointing to 'mezovuduw.ru' was found, suggesting a download or redirection attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mezovuduw.ru/award?keyword=cambridge+checkpoint+english+coursebook+9+pdf+free+download
    • http://nakotigolajeg.scienceontheweb.net/40063905426.pdf
    • http://yewes.space/dr_kaba_kamene_study_guide39lct.pdf
    • http://copyrightsupportforlnstagram.com/powerflex_40_fault_f005siuwh.pdf
    • http://wekeb.space/sejepamakateler9ip7.pdf
    • http://extrameets.fun/dj_sound_effects_free_download_sirensdz210.pdf
    • http://majusenise.sportsontheweb.net/texore.pdf
    • http://boothattendant.com/lagazik8ga3.pdf
    • http://gonojokolekovo.22web.org/85562163004.pdf
    • http://xuvaxujogilo.mygamesonline.org/59434916719.pdf
    • http://kudopifupelixi.22web.org/fortigate_firewall_600c_configuration_guide.pdf
    • http://salearea.pro/misocial_free_website_psd_mockup_templateydunt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_f41a4fac49ee44c196b3c16bcce3d230.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_e4c997db98b34adb9a416685f0e783c4.pdf?index=true
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_bc7a4924785740bcb7a8c5dd1c92d8a9.pdf?index=true
    • http://surodumetajaz.epizy.com/ancient_greece_economy.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_341be87bb0f4440ebdc40de754a61d2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7723a2c4-e84f-4653-9f16-7f8b579179c4/how_much_do_brand_associates_make_at_old_navy.pdf
    • https://uploads.strikinglycdn.com/files/671a0ceb-0b32-4b93-a228-46bb9237259f/sunajilido.pdf
    • https://uploads.strikinglycdn.com/files/08af5d51-f816-4da0-a010-6d200772b05c/87788342258.pdf
    • https://uploads.strikinglycdn.com/files/239e8cc6-f4c3-4ad4-9394-b01e7fbe1a0f/samsung_grand_prime_pro_frp_bypass_without_pc.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_off00011361.bin
99aef37ed54085757269556e60d1bc8407ab36f00b7f2edc5b495107e17a84df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 5928 bytes
font_01_sfnt_off0001276b.bin
e7788f335373d83407f5b1a3621413b318dc1e1d667c76163f89a6dcd29e3258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 12708 bytes

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