Malicious PDF — malware analysis report

Static analysis result for SHA-256 c857bf078ad298e5…

MALICIOUS

PDF

71.9 KB Created: 2021-03-03 02:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 19ece7ce78a00d536deda50df07cd737 SHA-1: 1a047f789a25a4e1f1b73c64f8f0920f56368cf3 SHA-256: c857bf078ad298e5448da7ded22f3c9e76279a88944bb74077b194172b671d75
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=what+happens+when+you+wake+someone+up+during+a+nightmare In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_6015fe1aa7837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fee7630389bd.pdfIn PDF document text
    • https://pokuzasovud.weebly.com/uploads/1/3/4/1/134108684/pijiwipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_6014697a270de.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/2729600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fef8522704e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_60364bd817b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_603cc6e8681f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_603ec5c5ea2aa.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/6641213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5fd2dcb0d24ef.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/ghPJiam/61138820275.pdfIn PDF document text
    • https://pilologalegalek.weebly.com/uploads/1/3/0/7/130740349/2074349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 5612 bytes
SHA-256: bd95accba3ba80c6fe2b1f90376d9f9841ead29844d3debafb3a3a1618227299
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10120 bytes
SHA-256: 8bda9e9a21621ca20ee9a1c62827308be9cb6f23eac20f16430ce1069fd8d811

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