Malicious PDF — malware analysis report

Static analysis result for SHA-256 24959f1d7d4b8ae5…

MALICIOUS

PDF

77.5 KB Created: 2021-05-19 23:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 37021fc06c89019f857ae49575ed4d1a SHA-1: 803ba8f85c372c497670b874cdbf5923a6759902 SHA-256: 24959f1d7d4b8ae5fde94fd39206bd7681227176b88b9163ccb96bb6940c5db1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=formation+anglais+en+ligne+gratuite+avec+diplome PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404107/normal_604ceee8775a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_603a7d0f42e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6041d90cc1e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_605619b232bda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446917/normal_60027ce067c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fd68ad85d850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_6039b83508ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_600191d150620.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/6e67dbecc00d9f4.pdfIn PDF document text
    • https://xisedemagi.weebly.com/uploads/1/3/2/6/132681548/rirazuzelapekel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff71a12accc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5fec4a026ad43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_60515a91ece6c.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/d2dd8ccb-0390-45db-b2d7-468c25234451/29762996169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c15ff6b-f50d-420b-950b-97b38f9a1811/vejinegerevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e84c6d1-594a-4bd4-83ce-20145ce36059/4889241245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40bc937-a90e-4fb5-9ae7-a830e932cf67/kododupujisosigivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656dd10b-2881-4f9d-8ef9-5215e6982510/20366921783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b18d447-e469-48cc-9dcb-e61f3ae2bc24/41103574603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2133b3-6016-4bfb-8834-23fc9b87231b/how_to_find_probability_using_normal_distribution_table.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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 5408 bytes
SHA-256: 5aa8f5b887a81f24a046005f5ec2c3705c9358faf4078bc34b5537f76d4c6e6a
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 12052 bytes
SHA-256: 7216e81d82c4f80b370262a263e02faf2cede236726f84f1efdf8e25697776eb

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