Malicious PDF — malware analysis report

Static analysis result for SHA-256 525add5938c739c9…

MALICIOUS

PDF

69.3 KB Created: 2021-01-06 11:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 253098425f447be20c37f8a9e6fa56b1 SHA-1: e9eda7f8ef6c2eca8bdf0ee29cf69c8463ec10a8 SHA-256: 525add5938c739c9439b287ab1f9aceb02f42909d5f144137eb8948e6098b5a0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag. The primary URL, https://cctraff.ru/aws?utm_term=antibiotic+prescribing+guidelines+dentistry, is likely part of a phishing campaign to trick users into visiting a compromised site. No scripts were extracted, but the presence of malicious links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cctraff.ru/aws?utm_term=antibiotic+prescribing+guidelines+dentistry In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/2heWBu8/fexunumiraporirebuj.pdfIn PDF document text
    • https://pusenosegunilo.weebly.com/uploads/1/3/4/7/134705238/kelukinavoje.pdfIn PDF document text
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/a9c85c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fc42d3a76fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/7kgjhj9/decibel_sound_meter_app_for_iphone.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/totizidunodorife.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/e7e0a81b5e.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/felasorarabipis/lekaledutuzugemomip.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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 5260 bytes
SHA-256: 96bc008d2e0d696f4b72cc9c55cf639a7c4db2318f219fa8be72bcfad522f226
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 10732 bytes
SHA-256: 7882c521a227a8fa817662bc4eb949012231728c6d99c5d0651f8b00a111645b

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