Malicious PDF — malware analysis report

Static analysis result for SHA-256 de84a4767b98ca7f…

MALICIOUS

PDF

85.7 KB Created: 2021-02-16 09:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7f26e2767bc09221068bb2bc588502ee SHA-1: 4191afcdbe5b4b9849a8030ba1418b94d8225779 SHA-256: de84a4767b98ca7f9570377c9e9bfd7064c64403f6b785cd1e600b16bb35bdab
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=exploring+elements+answer+key+pdf'. This indicates an attempt to lure users to a phishing or malware distribution site. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing and redirection attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=exploring+elements+answer+key+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490122/normal_5fff3eee6509e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600a436bbbd44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc677bb89713.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/jumakidemo.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/645697.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/lebuxutet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389809/normal_5ffb4377a2450.pdfIn PDF document text
    • http://wamikesaximilub.22web.org/90502875349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5fe3a85fe801b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381988/normal_6008356fe1354.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubazinosimisod.rf.gd/guitar_pedal_chain_guide.pdfIn PDF document text
    • http://zugosixefi.epizy.com/how_to_update_android_tv_box_firmware.pdfIn PDF document text
    • http://dujisuga.epizy.com/all_sheet_metal_worker_jobs_toronto.pdfIn PDF document text
    • http://karadefega.epizy.com/17504272343.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/constraint-_based_question_answering_with_knowledge_graph.pdfIn PDF document text
    • http://niworojuxine.rf.gd/alan_walker_alone_karaoke_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/angularjs_vs_react_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/47064178226.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/bokuwidubuxona.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/intel_dual_band_wireless-_ac_3168_driver.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_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 5644 bytes
SHA-256: fd88181036952a9ab7e12f8f821673ef9926b3755ba57cf81653e4acc1b9928d
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10392 bytes
SHA-256: acd94a9b27b7a132b00425ca2918087fa12164461c49abe2f355f8c0d6da31fc

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