Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4b13d2b5de9441…

MALICIOUS

PDF

70.4 KB Created: 2020-11-19 00:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 442a637e095a42f0186abf62a56d90b6 SHA-1: 91ed50eb13afff4dec3bfba459486c3b23d116a1 SHA-256: 4e4b13d2b5de94414b2a526ab96b178c105c58e1995e03a0043b9ee1d7b361e5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/123?utm_term=zoom+aa+meetings+kalamazoo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f9e91c892fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f89d7b0038f9.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/gebutevuxo-jibelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5f98658184dc1.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/dikito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f883b8de517a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5faa5636c0ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_5fa9a468e9fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_5fafe17329f3c.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/1d760dd4-bc64-48f6-af3f-0406a64ff808/riverfest_2020_canton_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8e66b4-6292-4f46-a047-d3dc7f84b4f3/imgchili_liliana_model_pics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655733d4-cd2d-4f34-91e9-8ab5a18b6a2b/91247875888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7445f3c2-b3ab-4e0c-ba81-370f02a35c1e/sitozapat.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 4980 bytes
SHA-256: 9637c5b06d8572d04169f877dd506d6ff55fbb00197a940d4c969b9a9d158fba
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 10480 bytes
SHA-256: 676eabf068004b8a636f05ff17f13368ec24b7ed5a6789d47e8a093f3bbefc06

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