Malicious PDF — malware analysis report

Static analysis result for SHA-256 803817c3dcc62633…

MALICIOUS

PDF

48.0 KB Created: 2020-09-30 21:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: ad856b3212e4ec5118e05f8bbdaf5594 SHA-1: 671b6ec92c8b6d9e09f3780ec274f4dde2b3977f SHA-256: 803817c3dcc62633f903fc02ddbe318f9821da54d246d10704111f150f22b9ee
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://cctraff.ru/strik?keyword=npa+malaria+prophylaxis+guidelines+2019+pdf In PDF document text
    • http://files.gravityalternativemovement.com/uploads/1/3/0/7/130739062/fisupudaj.pdfIn PDF document text
    • http://files.shsbusinessclass.com/uploads/1/3/0/8/130874326/b9c1828420b4f1.pdfIn PDF document text
    • http://files.eflenglishdaily.com/uploads/1/3/2/7/132740990/7167813.pdfIn PDF document text
    • http://files.sycamorebandandorchestra.com/uploads/1/3/1/0/131070289/d11c8936.pdfIn PDF document text
    • http://rawozeref.debbieyoung.co.uk/uploads/1/3/1/4/131406798/8193974.pdfIn PDF document text
    • http://bedipegim.fumckidsconnect.org/uploads/1/3/1/3/131383409/516eecba2ea0eba.pdfIn PDF document text
    • http://lumapika.3littlebirdsstudio.com/uploads/1/3/2/7/132740449/3470420.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/eba92c4c-2ee0-43f3-865e-16cd3a980ea1/sutuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5104/1447/files/60925076495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/10557495204.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_off00007c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4D 6076 bytes
SHA-256: 0be6c922ed240094df928aabac690d864ba65ef0b20de98f8810ee6394f7776d
font_01_sfnt_off000090e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E5 10132 bytes
SHA-256: 4fac05f38af48f612a7461ff7a2a1c5ca9e2c161e870733a0dfe22cb2a8f0edd