Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c65e53c198acc2…

MALICIOUS

PDF

68.1 KB Created: 2021-01-24 16:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: c4f47ed928f45a0d1032d3b489ec8d64 SHA-1: 52ae6f8710b6b3a1f2e0205b312b05b3bb4c0881 SHA-256: b9c65e53c198acc2367be14ceeb840cb7618338936b5ced8cbdf09a304d205cd
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://jottigo.ru/aws?utm_term=basic+electronics+pdf+tutorialspoint PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420260/normal_60055f5a26066.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/fepisipuwuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_600ae7dbaed7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fff75678332c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_60060077eda4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_60015736b68ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fc65b55509f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5ff90da315b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_5feaf12609d00.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/6632364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fc800322477d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5fce5af7ad500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff43948bbc8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefolinum.epizy.com/26954018851.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/titunulizulu.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 5200 bytes
SHA-256: c842913a1bf78cb1fcee8f918bb86a06b79b2da06325cb3335eab5fc4be99b10
font_01_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 10668 bytes
SHA-256: bceeed2a9adc53e2e01cf44194723b2b42d090ba758a4624411aca511105e662