Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec0f24e6bf7fd7f…

MALICIOUS

PDF

71.6 KB Created: 2021-03-05 02:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 85e91b748c28c344b49155c99161cbb1 SHA-1: 9e03877e303dee45275785faeaad0db2ed1de20e SHA-256: cec0f24e6bf7fd7fa7722d1902823f755c881f12597bb2eca1764287201bbe60
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=literal+equations+worksheet'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=literal+equations+worksheet In PDF document text
    • http://1xbets-regs.site/74980335021oj39d.pdfIn PDF document text
    • http://helpcreditscore.info/435227491400c2gr.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/ce0fb.pdfIn PDF document text
    • http://magnetfix.store/english_for_everyone_level_1_beginner_practice_book_downloadpvy13.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/cjdj8ih/descargar_emulador_game_boy_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/is1Q2bS/samurai_2_vengeance_1._1._4_mod_apk.pdfIn PDF document text
    • https://mitavubadez.weebly.com/uploads/1/3/4/4/134458848/d43d6b98029e.pdfIn PDF document text
    • http://subfamjtii.site/batogasemusifakuruvozibag2oe2v.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/RygcR2g/74084023508.pdfIn PDF document text
    • http://naturaitalia.space/9th_grade_vocabulary_listi28bg.pdfIn PDF document text
    • http://mrshadow.net/the_trials_of_apollo_1_summaryryd4i.pdfIn PDF document text
    • http://zuvels.xyz/pajitirajisamotikatinusag6cpc.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/9d5b0f75c.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/5446986.pdfIn PDF document text
    • http://espaceabonne.com/software_architecture_designbvr3i.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/jadilefuxur.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/rovikibixu/liravupanojafotunobejujuw.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/nenojexipasekelefaxelig.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/34504232943.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/assistive_touch_for_android_2._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b313dd85-e70c-40a0-8d88-154e0e1dfded/the_hobbit_book_original_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e770a2da-0253-4fcd-b274-5e3e92dbd25d/bose_sounddock_bluetooth_converter.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 4996 bytes
SHA-256: 8cb5e22d94e9ded56df9e12cb8c0df06af233aa97d40cde39378d070e8ee6aea
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10588 bytes
SHA-256: b6043bba87b6dc33405605b47c17d63fdc1c9423a35f7feee8f935b0530b8816

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