Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f0d2181681a36…

MALICIOUS

PDF

91.5 KB Created: 2021-05-19 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2773b529506daaa687b741008afbee6 SHA-1: d9d0a23914ec9532beacc5d25c96f34103f89726 SHA-256: c10f0d2181681a36090dc94a1987f701678f801193677904a1868e656c76d6fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO link farms or to redirect users to malicious sites. The primary URL, https://jumiwimov.ru/strik, is flagged as suspicious and likely serves as a landing page for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=organik+kimya+%25C3%25A7%25C4%25B1km%25C4%25B1%25C5%259F+sorular+ossmat
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fdb2856141f9.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_601dc35b5dd46.pdf
    • https://static.s123-cdn-static.com/uploads/4464323/normal_6005e005c7073.pdf
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6060f68819293.pdf
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/dejasosebifaka.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6022f5277383a.pdf
    • https://cdn-cms.f-static.net/uploads/4463551/normal_6036ad3fad1ba.pdf
    • https://static.s123-cdn-static.com/uploads/4496204/normal_6008f4d5ee057.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_600c8bf104bc5.pdf
    • https://static.s123-cdn-static.com/uploads/4374685/normal_5ff9c09530b16.pdf
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/1705607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zodawanuror/sql_server_replicate_database_for_reporting.pdf
    • https://s3.amazonaws.com/pululusodogi/picard_flute_song_sheet_music.pdf
    • https://s3.amazonaws.com/dagasopones/tepur.pdf
    • https://s3.amazonaws.com/zodawanuror/canadian_citizenship_study_guide_answers.pdf
    • https://s3.amazonaws.com/memexelu/introduction_to_academic_writing_vk.pdf
    • https://s3.amazonaws.com/babetafaperaxov/hedwig_s_theme_piano_sheet_music_advanced.pdf
    • https://s3.amazonaws.com/sesafefanulokam/which_are_the_different_types_of_ecosystem_answer.pdf
    • https://s3.amazonaws.com/donake/chadariya_jheeni_re_jheeni_video_status.pdf
    • https://s3.amazonaws.com/fenatagazise/circumference_of_circle_word_problems_worksheet.pdf
    • https://s3.amazonaws.com/fosagoba/93864403358.pdf
    • https://s3.amazonaws.com/fowikorejodi/parathyroid_gland_histology_guide.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_off00012194.bin
4e62e47c01bdc3205e50d8b8e0d29c1d58a334bb7f3ab0be42cc1c61d4768024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 5660 bytes
font_01_sfnt_off00013425.bin
8f6809473a181ba2809b865213b9b6e8f1660b898cd68bbf7629ed7733286167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 13824 bytes

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