Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4859febfab6d92e…

MALICIOUS

PDF

134.0 KB Created: 2020-11-06 11:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 228055ca45a5840d300b83d0786f7247 SHA-1: 479731346373d3ffdb3d7a545bc20bad265467f1 SHA-256: d4859febfab6d92ed64b49cb2424922dcb2931c94c547db09915570b46fde3da
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?keyword=hurricane+hugo+1989+charleston+pictures In PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/lewoguju-fosevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f9624d0316d3.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/2535460.pdfIn PDF document text
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/8748393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f9e6b6003f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f9e475314163.pdfIn PDF document text
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/1d890f9f8b4.pdfIn PDF document text
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/jeraxirif.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/08f14176-77e4-49c2-a676-d6e90918d4ba/tusuruxejuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2886b4ee-cac5-4405-8904-8d338a9e0ba6/biological_half_life_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e8c816-34be-4504-91cf-971298ff71f4/38284282318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c30202-0184-4ff1-b2c5-50d638c26bb7/xanowunote.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/saweterovugibidofimasapa.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_off0001cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF2E 5556 bytes
SHA-256: e50d328c9acc5f7362ec7fbf82096d16554bb875c07b2fd9982edd5441d09357
font_01_sfnt_off0001e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E20F 11756 bytes
SHA-256: 7042f40abd2a8011f328ac8d3ee7f44604b07a41e1af2f4d907df4a3a845274b

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