Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68ce21dd5ad59bf…

MALICIOUS

PDF

72.4 KB Created: 2021-02-22 23:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 66c97a197ce91b970a4a1196ff152b20 SHA-1: 78c8b9ec536b268c890af87c823ffde9c0631f08 SHA-256: b68ce21dd5ad59bf96a8ce4c50369ed7e1bc4f7e12e6ce4776757cdf7431d4a2
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://crophysi.ru/wix?keyword=holt+science+and+technology+grade+7+online+textbook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5ffcf7573ca7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fc94d6194b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fd8b72fa0a4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5ff7c7138e918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff45d0ad0411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fe7a7aaa50dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_600542196bda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_600e37eca5262.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/c1d677c48b85fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fef9696c1beb.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/wanalovum/kesox.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/mediafre_software_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/4944283537.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/vimuguwadugexulajib.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/88316409481.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/dewazizat.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/ximuzuwipafixozawupeme.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/suwiwifozoxokiwo.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5616 bytes
SHA-256: 2c373d91d3adbb183cea2087fc2cfc33f35216c27bcaa290fdcb4f852b2e8dea
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 10524 bytes
SHA-256: 221f2aa5a1e3d358a53b1b898aa5f4346ec1e03374a469a743289f8530024c2d

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