Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6564a8208af58d…

MALICIOUS

PDF

60.2 KB Created: 2020-12-13 19:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3987d1da51ae8e3e59d976e2f960abde SHA-1: 90f98107c1cb96f32c1c45b40c26684415769fbf SHA-256: bf6564a8208af58d6352c8ae726ebeee5996ff6f202d304d9054c9854ac84139
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/d3d377821e21b.pdf.
  • 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://cctraff.ru/strik?utm_term=synthetic+division+practice+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5fb27de15c3b5.pdfIn PDF document text
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/d3d377821e21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fb36c15ca5c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc54a99f7cf8c754047cbac/t/5fcac46a4b87e7790e8f385e/1607124074702/jebovobidutur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439893b0-eef0-44a2-8001-c37137a0f0e5/tigeneval.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f3af1c8c741314320bf8/t/5fc366e5eaf37e3b64079a01/1606641382259/william_floyd_school_district_demographics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee90e6d49a06bb5609e8/1606282897849/jedorivefobixuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245883d8-0533-4523-9239-d5a5d1ede76a/sebofivofolarasedamesew.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/gudukinor.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/zilupo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3998b403f5353fda6ad60/t/5fc86e76217b3604eddc8ade/1606970999811/tom_and_jerry_meme_crying.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 5548 bytes
SHA-256: 6b3cbfff4d65e201c9e7eb134c813b9a07a32bd5756879a78166aa5d22f3d09e
font_01_sfnt_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 9732 bytes
SHA-256: f47a1def34bd8a3dc0b27e84f1bdcdad99987015c29834ee11936eb102d5f695

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