Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3ef397c6b9917a…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 23:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 45176da172fe85483b408702916994e3 SHA-1: 045ea5c206ad4f966983b0261106a5e1e2766a63 SHA-256: ee3ef397c6b9917aac6b61e9986b565826402e2f71617d880516763c98e99afd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged the document with high confidence. The embedded URL leads to 'https://yafferge.ru/wix?keyword=parts+of+a+computer+worksheet+elementary+pdf', which is likely used to deliver a secondary payload or conduct a phishing attack. No scripts were extracted, but the presence of a malicious link in a document disguised as a worksheet strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=parts+of+a+computer+worksheet+elementary+pdf In PDF document text
    • https://cdn.sqhk.co/vivutazawi/3ijekhb/real_talking_cat_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5ff5f99d34cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/I6hauB5/xejovezadaropi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5fe33f7f8032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_602659afcbb32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_5fe942f1e7e70.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/hcUS2fj/jigudoxuviwolijawuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_6029ee631b2b3.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/AjbWjhW/sanot.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/fejenijovekozu/99817210948.pdfIn PDF document text
    • http://buvudateba.epizy.com/the_practicing_mind_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/indefinite_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/14411000952.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/centrifugal_compressor_performance_curves.pdfIn PDF document text
    • http://nuvijexuwafado.rf.gd/excel_macro_activate_next_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/beyblade_v_force_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/60900527072.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/20291079052.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/53389688946.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 5652 bytes
SHA-256: 2ca69b6f4b3646a3b1320dd885576fa2cf84b75c09e54b586efc70f4e222a07d
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 10192 bytes
SHA-256: 8341feccac846f6815b318e5c7db853115c569373cb4252de967f16ea9b2357e

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