Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeccc42938af537…

MALICIOUS

PDF

128.9 KB Created: 2020-11-26 03:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9ce4960c75b2643b9320578ed562cedf SHA-1: e9f22ce8e1ad8c2859a22b5b7cf32c681756ab7b SHA-256: cdeccc42938af537f3b2a9034024c51d80ecae23a60637cd5937b4ae7a7b7e39
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external links, including one to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=famous+quotations+math+worksheet+answers+pizzazz PDF link annotation
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/pinekalugovep-papijozigaxizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fac327b59632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5fb51509893be.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/e2c6d476-8cbb-467f-a267-797cbc9d7f74/wondershare_filmora_7.8.9_clef_de_se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1dfdca-f012-4953-8519-5dc2cf09bc75/ariana_grande_album_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c261a4-a568-40b6-925a-7bfd2589ef87/oracion_de_credo.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/xitodewutagaxadujav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f33205c-f130-4c30-a37b-9d69758cb9b3/17021905984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddeafe4-5b20-4704-9ac5-bd9e55958116/nilunodiretutupiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62fa4863-cc58-4cf0-99a4-1ea8d2f68d00/90897121284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf155d9-300d-411a-89e7-594f60e87b98/72423310561.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_off0001bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6E 5316 bytes
SHA-256: 082eb7a09d26a6a709ccde673c4e7d621808629c1e02683c2659aada78edbe7b
font_01_sfnt_off0001cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD78 12096 bytes
SHA-256: d5afa636537a7b67f3cde1d23078edaa7a195ba4d6b93e64747ad0a3d972f690

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