Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c2e60086c4f004…

MALICIOUS

PDF

82.6 KB Created: 2021-04-25 00:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d4a26cec76beddd573fae0aefd7236 SHA-1: 1a9be2d71c558ead852b7ad1f9398e55ab1d5d33 SHA-256: 99c2e60086c4f0046e96b065f4dd5d76818f50b351de0dab3ed230721c4ea944
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=biochemistry+textbook+satyanarayana+pdf
    • http://xujaxul.mywebcommunity.org/claves_de_bomberos_de_chile.pdf
    • http://fekedusotuxena.iblogger.org/jomusupexekezilovonen.pdf
    • http://tijudozi.scienceontheweb.net/advanced_broadcast_news_production.pdf
    • http://xekizarobofoza.22web.org/how_long_do_you_go_to_jail_for_3_felonies.pdf
    • http://zasopawemumobaw.iblogger.org/treatment_of_down_syndrome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e28b580a-ce66-4aed-b90c-9b97b84a463f/maroo_of_the_winter_caves_chapter_13.pdf
    • https://uploads.strikinglycdn.com/files/52d1def2-e186-49d1-8770-9e5b5d996fc3/fezifad.pdf
    • https://s3.amazonaws.com/wutisigila/bapinufazufuxox.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_7db77d58ba5f4b588f14a5bb207b6ec1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02149265-4981-456d-9e58-ef50d06c62e3/21233459186.pdf
    • https://s3.amazonaws.com/wegemebufojafak/northern_eurasia_physical_map_answers.pdf
    • http://bosomonuzopedu.rf.gd/gametogenesis_pada_tumbuhan.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_56bbc976a4f047ac8a41428c8df10337.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7df598d-8c22-44cd-9d76-5906fc0ccd66/how_do_you_bypass_the_lid_lock_on_a_kenmore_washer.pdf
    • https://uploads.strikinglycdn.com/files/6cb9f6ed-e9dc-4b9b-93ef-503c753b38aa/bijejer.pdf
    • https://s3.amazonaws.com/luborinizu/gitabowibikorisanerepijab.pdf
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_6cee65c617f44713b924b24d743a4734.pdf?index=true
    • https://s3.amazonaws.com/fosawef/what_is_the_importance_of_statistics_in_social_science.pdf
    • https://s3.amazonaws.com/tobito/what_kind_of_oil_does_a_2006_toyota_sienna_take.pdf
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_1d3a77cf41c340edb55c97145d8688a9.pdf?index=true
    • http://dasilumenuf.rf.gd/30631876572.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_off000103ed.bin
686aa7550c3a11ad186b9595a6b971d1c4402a74f7b650e85e19a652d9c3c4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5784 bytes
font_01_sfnt_off0001177c.bin
10cf72ba493d9d68d308b6a8b6452b80bc04bbd14c7b118831931608cb6d11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 11080 bytes

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