Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebdf0da53230fde…

MALICIOUS

PDF

77.8 KB Created: 2021-02-15 10:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 76ae58df0d0533ef18a9723afc4a78f1 SHA-1: 7e70463c4dbb610ed45e9fe5310e2891bcad9777 SHA-256: 2ebdf0da53230fdec7cd2b34ed11415c2ac4947d1c3b42275bf5385c3be3e548
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://leonvi.ru/strik?utm_term=link%2527s+awakening+switch+walkthrough+turtle+rock', appearing to be a redirector for a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=link%2527s+awakening+switch+walkthrough+turtle+rock PDF link annotation
    • https://cdn.sqhk.co/wepigosogo/Dhhhcjf/mastercraft_crafting_and_building_pc.pdfIn PDF document text
    • http://richmaya.site/bundesliga_tabelle_2018_19m7wfa.pdfIn PDF document text
    • http://jotipire.iblogger.org/html_email_template_outlook_2010.pdfIn PDF document text
    • http://converstarget.ru/zabitasubufejasiwodh9fj.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/36795137976.pdfIn PDF document text
    • http://civiliscmq.online/lcm_worksheets_6th_grades5c3p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/3_dimensional_shapes_worksheets_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/free_movie_anagram_quiz_questions_and_answers.pdfIn PDF document text
    • http://rexawego.epizy.com/bmw_x3_2019_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/camphor_plant_information.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5192 bytes
SHA-256: fc50655d270a42cf376a314c3460ef4b58fcfca1cb49f385478f6b62f39cf53f
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10092 bytes
SHA-256: 0dce65aa538dccfa9cfa2c8c3bc381706d83dcc539e3905fe09124a68cea3dcf

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