Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f3ae8efdf9246…

MALICIOUS

PDF

65.5 KB Created: 2020-12-16 15:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93956279a36bd4d69fa5a5862a47e672 SHA-1: 90bd40d76304087c3cbc32618c2989ceb8a6efd8 SHA-256: 572f3ae8efdf9246ceb18b2797f232e8337b2028ba2b24f5f54ea358542aa14b
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=delsea+regional+high+school+graduation In PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/tidomixagekun-xinitepoje-binijig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451941/normal_5fcd501dad88b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fb5f7c55b619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf080e18c5c478ec094aa/1606283392931/innovited_hid_flickering.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b6f82bbd740658277995/t/5fc8a007d6e0cc37e34151dd/1606983687678/zuferokuzuxupadepumur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fe30abaecd33182fe85c/t/5fc514b76457125654dd03ca/1606751415158/8505043288.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1116c11f6a41984869c2f/t/5fc41ec83f75b16643558176/1606688456893/the_power_of_the_purse_means_that.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5249fd49dd124474fcf6a/t/5fd6df5c102ca46975f64ff2/1607917405655/fimiguvedop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce49d56a-0fcc-47d8-9eb6-fd9d3b022d4e/ama_style_paper.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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 5200 bytes
SHA-256: 2a299c8b5f27bf8d7a0835975b8641cf48cadd77ecdddc26437cfadc282eeaab
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 10256 bytes
SHA-256: 5f9fa609c6f8537cb323bcf4477616feab23ed2324a6154b8e1193c6474ff5ff

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