Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f3975ffe086f7e…

MALICIOUS

PDF

62.5 KB Created: 2021-02-10 21:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c9de06d771945edf09acea1fb45faadf SHA-1: a2cc9c5ed3b0a91c9d5cf99573c4e652cbb90002 SHA-256: 82f3975ffe086f7eb2002ffec7bd42008c531eed0b0fd7ac100bcd66df11636b
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/wb?keyword=chuchumaa%20by%20willy%20paul%20video PDF link annotation
    • https://cdn.sqhk.co/timadupak/iEIKghM/26812225257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff27345a9715.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/fikonedowamasofisivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5ffcbc03625e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_5fd30de54809f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5fe498d09ae46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fffbbe6ce6ff.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/kugelilizibuwum/workplace_investigation_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/chemistry_worksheet_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/kipafi.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/20714213047.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/57450646294.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/estimating_numbers_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/57937486518.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/b_p_love_images.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_off0000b686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB686 5340 bytes
SHA-256: d20da14744215647372b19721bf66ed1203f7bb8e1648ecd43324046170cb176
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 10852 bytes
SHA-256: dfe6d336aab8eac0decc0fc4e7a801269764b21fd2f35145b9cacd532a51c71e