Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a2a4ac8fcd76cc…

MALICIOUS

PDF

71.6 KB Created: 2021-01-27 17:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: dbd1f7e1aff80e8b6920b90db1cc0a4d SHA-1: fc77f0804d77f16ddaa709e70755b325166ec542 SHA-256: 71a2a4ac8fcd76ccb898512a3b7f68c079356cbcef1c9e3fb67cea0f152ef779
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wb?keyword=robert%20kubica%20formula%201%202019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fcb794e6e74b.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/venujotesupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff8c6562c834.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/givunakexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_6005930798589.pdfIn PDF document text
    • https://xetizokabonon.weebly.com/uploads/1/3/2/6/132696323/3f404.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/5652050.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/406bd.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/jemutijuzufara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5ff8576b346fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5feee999b5a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5fd8dbad2e55e.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/6639553.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/5b797a3ced760.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/fedojigudaj/4341078662.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 5544 bytes
SHA-256: 816159a2673e8902b48e36555447ac2968b51eda20f2ff6954a71b709d404306
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 10820 bytes
SHA-256: 2b30686527784d94e5bf9d2b077d8ddc08d9813a49013743270713494a058e49

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