Malicious PDF — malware analysis report

Static analysis result for SHA-256 26985717d338d819…

MALICIOUS

PDF

62.4 KB Created: 2020-12-16 22:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d3ff80c0643e9c42f164e8106e8ac8d4 SHA-1: 1c081edd45e0d41e4a28596cdb2a3b70bbe70e78 SHA-256: 26985717d338d819566f6cefc33cf3cbded9dbd8b40a572e44efb0d2779d2be5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL is disguised as a student activities manual, a common lure for phishing. While no scripts were directly extracted, the PDF structure and malicious link strongly suggest an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=nakama+1+student+activities+manual+pdf In PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/xesebopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5fa5b0b29bbcf.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/maziv_vukofilit_sesitomajeje_notufonukosamek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5fcee9e02848d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f8d3e3fbb424.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/vuliwisuwig/surolivuledalojilox.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/chrome_extension_adobe_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/daily_expenses_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/xeramobelonoroxalo.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/32107091957.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/android_arsenal_spinner.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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 5348 bytes
SHA-256: fc36c4db327e70d26ea8fa282a5b0befcef0f32a6c0b09e0157d3073c9a26f3e
font_01_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 9784 bytes
SHA-256: 2a487ae7c1561a743dd5bb0347025a972b0e052e467239b2f663c78981a78e5f

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