Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9641c14d19ea19…

MALICIOUS

PDF

67.0 KB Created: 2021-01-10 11:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 8a906af777440373598d88122958d5dc SHA-1: 048bd2ab8a24dc14e0a972dc274c9c141a590a12 SHA-256: 4f9641c14d19ea197b1b4f360e10ef998d05d8881687722dcf11ae50dd3b13b7
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=zombsroyale.%20io%202d%20battle%20royale%20battlelands%20royale In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fed3d043cbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5f9bcdedc0078.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/jofizosudobinezo.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/4980091.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/LdicjeA/dog_simulator_german_shepherd.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/pitabixup_jugimukiwofojen_kagopa.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/piwupevivotixi/vudowobamirafagofi.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/jurowunejixus.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/plural_nouns_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/ownership_structure_and_financial_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/placement_report_fms.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/four_seasons_nails_chester_va.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/muxipaluw.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/52481362978.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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 5336 bytes
SHA-256: 23855d3b3fe721ba24822785ab18e1776d1c2494bb22f33660a1f843c652742d
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10160 bytes
SHA-256: af0dca19e500279ea977c7e5523fcaa3fb6c170bb4a682000adc53902f24541f

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