Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1aa1c9cc2726b7…

MALICIOUS

PDF

85.9 KB Created: 2021-02-15 04:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f8c9f6a7a23cc84f476e48c0ac535c5 SHA-1: 6a75322e832408e0f299c12666ba4ac801197cb2 SHA-256: cd1aa1c9cc2726b76952f1ad112e03a2c3848c6e89f5a5e02833dc375595d367
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'Summoners War farming', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wix?keyword=summoners+war+farming In PDF document text
    • http://leree4.club/562267361733g9td.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60226e8c3b2cf.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/TbbjiRq/general_knowledge_quiz_games_for_class_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_60026f8e7e74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6012255f6b6b1.pdfIn PDF document text
    • http://digitalcalakk1.xyz/scrum_master_trainingd2mso.pdfIn PDF document text
    • http://copyright-security-ig.com/amish_tripathi_sita_warrior_of_mithila_free_download3h6cm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ff1cc4208736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_5feb0d72ef296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601e0478efe5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5ff27982586c0.pdfIn PDF document text
    • http://megalit-korolev.ru/8309364000jbtz0.pdfIn PDF document text
    • http://geosen.net/bar_menu_template_free_psdpjacm.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/wupiwupiwot/section_21_notice_to_tenant_template.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_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 5248 bytes
SHA-256: aa6fa48117e19ee1638def1ba636978de466d9c2205642078863e4a20b4363a6
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 12228 bytes
SHA-256: 51f6f416b74869364612d299275c927e4d5e697c71eec756d9c9cafd26a4dc87

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