Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33dfdfd2e73e2a…

MALICIOUS

PDF

46.8 KB Created: 2020-10-02 16:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cee6be24a37a0dd02e195a1234beeb6b SHA-1: de2a95a555affbec0a190a5ad0291627431db2fe SHA-256: cb33dfdfd2e73e2ae395aac2a9bec1362b422e880b6fc6ca1252c448c4d7e604
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=solving+equations+with+square+and+cube+roots+worksheet In PDF document text
    • http://files.campervantoursuk.com/uploads/1/3/0/9/130969231/naken_lagurovipuz.pdfIn PDF document text
    • http://files.dogscantflush.org/uploads/1/3/1/6/131606325/zamubal_jisumadilewit_rebopurupej_zivipoluve.pdfIn PDF document text
    • http://sugofuf.oneeastpaloalto.org/uploads/1/3/1/8/131871787/3121661a456254.pdfIn PDF document text
    • http://dozonuzu.south7thscience.com/uploads/1/3/1/4/131482976/rapezuvidel.pdfIn PDF document text
    • http://files.everywheredog.net/uploads/1/3/1/4/131437241/fa15fbb2e751.pdfIn PDF document text
    • http://petakoji.laurafrohphotography.com/uploads/1/3/1/3/131379699/borunokatebazidata.pdfIn PDF document text
    • http://dipuvizi.mankatocomedy.com/uploads/1/3/2/3/132302915/fumumo.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/ee736769-5d79-477e-bfa8-661637d55c7d/5254381115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c622708-ec12-4bf4-8e36-2ff7c5b7a913/19056904392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b11b2-abc0-471e-988c-fe5b4dfdcbe0/11965964747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfb0e8c-fc7b-4a99-900d-5cf27bbcbcbb/tezamubij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d709d99a-ed06-4450-a408-0df7df2db0b6/padikegavokejefekewilut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928143b5-972a-4b51-bd8c-63ebb6c3bfd7/pavovigelekisopuxanowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae597b3-c3bb-4d18-9036-273f87402286/55825091532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94b1bf7-5c65-4fe2-9703-c5c2df75dc94/17703976090.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_off00006b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 5668 bytes
SHA-256: 31aec2efc81631e35bb0fbc1aa0beaeb719032b4914f3d7a2a3b0935cd30566b
font_01_sfnt_off00007e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 9732 bytes
SHA-256: 6f137af4fdeba9e22e3e53fb2cae549b05a9f94a8d95513db3276be8d5802852
font_02_sfnt_off00009f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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