Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a23a56eeee6d2d0…

MALICIOUS

PDF

71.1 KB Created: 2021-02-10 00:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 142a79f948211eb0cb564d5b7e45bcef SHA-1: 034178e71828d53cd1a9907de18d45d0903d13f7 SHA-256: 6a23a56eeee6d2d086f075df58bc7cd11f41dbb34f3390bca08f48c6ea75cadf
196 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
  • 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://druttle.ru/wb?keyword=math%20worksheets%20for%20kinder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465919/normal_5fff5de4caec5.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/hj7ghid/dakopidaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5ff5df59ad82d.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/hhaLSGu/taptap_apk_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_600d7bd7ae0ff.pdfIn PDF document text
    • https://xomivumikeso.weebly.com/uploads/1/3/0/7/130774979/dofaxenigasep-kepivapir-likozagomugija-ruxesumegebed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5fe1c9ca20631.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/9849e43b84af6fd.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/gmmRBhg/widiliraxopi.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/icjdU2V/17634664119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5ff5862378da0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffcbbf2af3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc7c8345b801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fddc41693191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fe161e7bfd8a.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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 5124 bytes
SHA-256: 1149a8a51d75e4780d25da40c501f17d2cdfeacdacfe38f9975c82e247d62dcd
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 11056 bytes
SHA-256: 274154a8974bf744b37f478c8ddf6fb53563137e085f0131c241c0355f593f13

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