Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed1d65d1d147b22…

MALICIOUS

PDF

68.4 KB Created: 2021-02-28 23:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 218b488c44655793a10b396278616488 SHA-1: 7fcb26df9e583e34c244b334da1c42216ca1f019 SHA-256: eed1d65d1d147b2271397bf7b6a3c1a7e9299a6575e283f335deae82a8734ec5
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://yafferge.ru/award?keyword=what+is+the+study+of+population+and+culture+important In PDF document text
    • http://nebemor.mywebcommunity.org/91184647570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5ff3860fcf1e9.pdfIn PDF document text
    • https://futiwoku.weebly.com/uploads/1/3/5/9/135957929/5da1f6f3.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/bxoBMhi/saxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f618282ba.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/ag8hjib/giziximifexoxevaxan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fc6154aed3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/ajajdha/35405885829.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/can_human_live_more_than_200_years.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/vnDib6V/learn_kung_fu_online_free_at_home.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/dewonironukosuxofokiv.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jejcaif/pefewepo.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/djczjiw/58368655942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_603911e124727.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_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 5508 bytes
SHA-256: 1b5460233a6a0a7200f36ec8b14095b695952234ac7069796cdd682c467a2d15
font_01_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 11116 bytes
SHA-256: 44864ed8146b30c90a35ff9a311e4fc34e07d8e626085740212b3b5d5f877487

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