Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c299a94dc6b2ea…

MALICIOUS

PDF

74.4 KB Created: 2021-04-30 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 361213f301852a53fcb7945469991256 SHA-1: 3764ea364036b3dd943011e2bdc023badec0fdec SHA-256: 27c299a94dc6b2ea217034745923455bb2e51d49967db8eebd6538c005961538
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to search terms, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=neil+gaiman+books+for+adults PDF link annotation
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/xogok.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/xitafivexotefirutekutujo.pdfIn PDF document text
    • https://cdn.sqhk.co/sodovokak/e6azvid/earth_now_and_then_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/oUDlcWg/wefilebukikunavil.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/conflict_of_romeo_and_julietbq1wa.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/17543455520.pdfIn PDF document text
    • http://ihsteam.ru/how_to_program_samsung_tv_remote_codesacnin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_6371aef86b9c49ba9e6cb7e4194635c3.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/chemical_reaction_symbol_latex.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_545d0412f3ed443f93bf5653fb147f23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d522c5f3-641e-424e-9d56-8e7fa2b833ab/2498823928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699978cd-66a0-4388-bfb5-05c596184123/toro_gts_6.5_oil.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_551a08276fe04f32acd09c3623760b6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/354787ee-8a2f-4158-b3b6-6ea30ad05a92/what_can_charge_a_kindle_fire_i_have.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_f344058e865945db85266f727311bc19.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/pedro_hernandes_dias_lopes.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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5400 bytes
SHA-256: a77ef49d13bea56e236f9ac621834110c0aebc04f4a3fcb7e897d74db7f4fa8e
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10816 bytes
SHA-256: b447019d02ee15e559faebf3c635746640b8b3965dfb54c72dc36a4ced503644

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