Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc38e9eb62dcb673…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 08:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b4fbc4feb0c254da8ddfb0e56048f3c SHA-1: 7b2ceeed7595d49ec33b22fab54f31a958c0be2a SHA-256: dc38e9eb62dcb673df971e90a3cb996eaf8d095718123ecdffb518f1f7214fc4
154 Risk Score

Malware Insights

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

The PDF contains a link to 'yafferge.ru' which is flagged as a malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure to entice users to click the malicious link. The embedded URL heuristic further supports the presence of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=elite%20air%20fryer%202.1 In PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/31f00db7f1.pdfIn PDF document text
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/zemajexateteb.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/5105854.pdfIn PDF document text
    • http://eurofamily.pro/sms_backup_restore_android_to_iphonewno0t.pdfIn PDF document text
    • http://stopro.store/29011304772axa1a.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/tuzewavipeteberebuj.pdfIn PDF document text
    • http://tehnotop.site/v_for_vendetta_film_poster2xpnj.pdfIn PDF document text
    • http://hayatevesigar.online/zexajifojewagupuxuwupirae6q35.pdfIn PDF document text
    • http://help-verification.com/bootstrap_div_class_form-_groupncr57.pdfIn PDF document text
    • http://health-top.ru/retusigedoebvh8.pdfIn PDF document text
    • http://tawojerikopopud.iblogger.org/ba_1_sem_date_sheet_2019_gndu.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/5735390.pdfIn PDF document text
    • http://shop-profildoors.ru/64026619540l0ozl.pdfIn PDF document text
    • http://clebohets.xyz/weber_summit_charcoal_grill_accessoriesnh0qg.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/zemunomipazikez/zivejiwomapuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/answer_key_in_mathematics_grade_10_module.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/mega_filmes_hd.pdfIn PDF document text
    • http://pabaxekuvo.rf.gd/zisegawunomor.pdfIn PDF document text
    • http://tekudadi.rf.gd/business_expense_tracking_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/hemangioma_hepatico_2018.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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 4860 bytes
SHA-256: 5a107e50246e0e8c7d75b1f9edde44577e840c6dc5c2dc69e20a3adf64be6e45
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 11212 bytes
SHA-256: 4fc0be5111267772f9ed29bd9d4d8dda9f38cd949f9238797b0fc779dcf5ff38

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