Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b538eedc36e3cd…

MALICIOUS

PDF

69.0 KB Created: 2020-12-01 12:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5954a4051bd50ff1feae9654effa7b93 SHA-1: ec1f121e82f7d9e2cb360b350b7cbbde8cdcff9d SHA-256: 63b538eedc36e3cd7a5b60fd277454021668bceae8f54da58996d851383a7266
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=mac+makeup+donation+request PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5f977b5b1ba72.pdfIn PDF document text
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/gapef.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/8807337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5f931a7094cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f8ffd4b75b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fa880341dca5.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/109221b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_5fc0824e8de29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fa1f4a0ed5b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fbf43989f244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f8bdecdeb43c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3a78d5-3485-44f0-9570-b61c2067bc24/21007255818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8baa56e-951e-402f-b269-c0ed5e3253b8/stranger_things_google_home_answers.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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 5380 bytes
SHA-256: e853fda8741783c9e12c34dd09b8d99395c7ef50fd81b5a49bb1467d5dc57812
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 10876 bytes
SHA-256: 520e18399394d6f8669fafe46fa6dac82995a4fd2098c77432acdfb97fa644e3

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