Malicious PDF — malware analysis report

Static analysis result for SHA-256 e191df2e849353fa…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 02:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61ee51e5d30e9669f8a2eaf1adbbfeb8 SHA-1: 90d45a0a6069aafe4847d0b400ecaec730061054 SHA-256: e191df2e849353fa2520b95c76e04b052fc06750f85ddcd795c2a0ed1bffd930
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+gland+is+in+the+endocrine+system
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/gujowogulutek-zevekufuw.pdf
    • https://cdn.sqhk.co/lofesaxudiwo/bhfjhcu/hokey_pokey_origin.pdf
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/02837ea.pdf
    • https://cdn.sqhk.co/budotedo/Gdie7gf/51100569360.pdf
    • https://cdn.sqhk.co/fegibowaxus/iaicTEN/81510444867.pdf
    • https://cdn-cms.f-static.net/uploads/4495065/normal_5fd0efb395d08.pdf
    • http://roxedizusugu.mywebcommunity.org/woxewebamusoraxif.pdf
    • https://cdn-cms.f-static.net/uploads/4485710/normal_604bb5c5c169b.pdf
    • http://tatanip.medianewsonline.com/milwaukee_bucks_schedule_2020.pdf
    • https://cdn.sqhk.co/guzamuvi/IDNEjdX/rudoxofezunafavas.pdf
    • https://cdn.sqhk.co/rijunawep/I1aTHij/top_free_games_on_epic_games_launcher.pdf
    • https://static.s123-cdn-static.com/uploads/4495393/normal_60008c7b750ab.pdf
    • https://cdn.sqhk.co/sovokeduseb/icidia4/jetpack_joyride_for_windows_8.pdf
    • https://cdn.sqhk.co/dedogupazib/XvpGgim/knights_fight_2_honor_glory_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gevejonitu.onlinewebshop.net/what_does_the_bible_say_about_jobs_wife.pdf
    • http://tobidogajetu.onlinewebshop.net/interview_questions_for_english_teachers.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/journey_to_the_center_of_the_earth_full_movie_123movies.pdf
    • http://neloralo.myartsonline.com/upsc_sociology_syllabus_download.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/94289097895.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_off0000e44e.bin
b9d79c8353157f593bd4f8f47eec4ebb20f808bae5f42bace86d1349022a60ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5468 bytes
font_01_sfnt_off0000f6d1.bin
ef9137b1b6b0d87e0121c82840a54fc8ff2a2995017e2b5cc365c3696cbff6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10468 bytes

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