Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6e9dfb6cfc9321…

MALICIOUS

PDF

73.1 KB Created: 2020-11-11 23:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 327437ea91b93ddddfb155f6d8eb55c4 SHA-1: 9da46786c2a34cdfb397cd149a36a5de4723c349 SHA-256: cd6e9dfb6cfc9321aac404940549ce87fbe520191a10a65b12e8aef21ce5ea14
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 0.9997

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://traffset.ru/123?utm_term=atom+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5f927ea571898.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/b74a4c72a589b.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/d3d1b55f-4119-4fb2-b539-fd0e47735903/tadujiwojaxulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fd31cb-943a-4da3-a109-38ef986ef6af/jufuzurajezevanoxobapemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5bd429-8ac0-4403-baf1-872701f574a3/fatixagaxawivujuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a695312-97f3-44dd-b0d7-5286f591563b/jexuwiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a2d508-9501-4240-b5c8-ba3a1ca2442f/sinukepute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bee5bf1-718e-4781-a4fe-89ae4adbb134/square_cake_pans_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6105c51b-8985-4e4e-86d9-115f7525db1b/95636313945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30140117-301c-43b7-b178-59bf3088c48e/93480687426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7038d36-ed0c-44c2-8e69-16ee99d5d534/tewamolaxekotajekijuriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79254a7e-a224-48ec-8d5c-b3bc504cf6fe/nadolanosofizavibi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 5036 bytes
SHA-256: 1a1dbe1691dbdd089046f53f87904da834ced052b0f330e80c5cd15ea5f683d8
font_02_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10260 bytes
SHA-256: 25740dee33a4e5d6bac3f5dd70c69b21fb04a2426b4a0b3bdfa9a073b60bfd9f

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