Malicious PDF — malware analysis report

Static analysis result for SHA-256 642c49a00fb06387…

MALICIOUS

PDF

41.6 KB Created: 2020-10-08 16:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 149bfba63cd1adc50c5eaaeb1a8cfff1 SHA-1: 310adc1e41588a3d832550647bd8000c6e1b31e5 SHA-256: 642c49a00fb0638729768818c9cbc7977f194581c93defce9a3566d984bf2358
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=formato+de+valoracion+de+las+14+necesidades+de+virginia+henderson In PDF document text
    • https://site-1039153.mozfiles.com/files/1039153/wumire.pdfIn PDF document text
    • https://site-1039564.mozfiles.com/files/1039564/64515714629.pdfIn PDF document text
    • https://site-1039506.mozfiles.com/files/1039506/16468990221.pdfIn PDF document text
    • https://site-1043115.mozfiles.com/files/1043115/sidigalukiponumidoxuxa.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/77759869776.pdfIn PDF document text
    • https://site-1039274.mozfiles.com/files/1039274/3087516886.pdfIn PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/47459353628.pdfIn PDF document text
    • http://files.muhlenbergstallions.com/uploads/1/3/0/7/130776801/432124.pdfIn PDF document text
    • http://files.knobbysidedown.com/uploads/1/3/1/4/131409909/wawufenonelexaw-tezimatax-soluwabigade-dopep.pdfIn PDF document text
    • http://files.richardwblack.com/uploads/1/3/0/7/130775969/0e3c77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7642/2298/files/solving_inequalities_by_graphing_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/73326781610.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_off00005d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5F 5508 bytes
SHA-256: 46466acb67e7df9f84ecd53fbdf3375ec99c5798526a09abfbb16a92abfd4487
font_01_sfnt_off00006fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFF 12720 bytes
SHA-256: 2493a20b6b2a1f91bbfb87a5dd360a29c79a8a3c373258fd76a4c065fbe2c629