Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23498e95ed62b27…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 06:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf0df30536a587e0b9b6b293897d5042 SHA-1: 9078e4d9a5aa53b1b34033b11334eee4a17fd78c SHA-256: e23498e95ed62b273a90917bbd05dbfe96333a3b9c654a70fb56aa1c92addd4d
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://traffnew.ru/aws?utm_term=joomla+4+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5fa166f7e26fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5f9f836d596fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5fa9e52d199d4.pdfIn PDF document text
    • https://vizipelijokefar.weebly.com/uploads/1/3/4/5/134512389/6409e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5f9b73a0e7155.pdfIn PDF document text
    • https://voganolov.weebly.com/uploads/1/3/4/3/134372868/8398550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8d1cd28d1fd.pdfIn PDF document text
    • https://vobobesi.weebly.com/uploads/1/3/4/7/134702984/vejowexabesomer_wuregasijilem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3b4fbf16-4184-4a77-a8b1-12ce33cbff9b/52878617997.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/halloween_bingo_dauber_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0393ff9a-939f-4a43-ae3d-0677176c2182/79440798022.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_off0000cab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 4580 bytes
SHA-256: 9a6816027762a99ebe97271c78f81fd102e642e7ffe9fcc4c34d37164c195e07
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10420 bytes
SHA-256: 5a6871ce91d36f1d60d5115e478b5d2740174d67b76c426939fee1edaedf6a43
font_02_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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