Malicious PDF — malware analysis report

Static analysis result for SHA-256 81209a50199e32f4…

MALICIOUS

PDF

50.3 KB Created: 2020-10-01 02:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0847d4df13501a5fdde12061957b5bd1 SHA-1: 34a40ec41266e2226e5ac5c26496d7f60a34097d SHA-256: 81209a50199e32f4b0c40660bdaaf218d7f6d333483d423d26d5cf93052325a4
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=bbc+english+class+12+pdf In PDF document text
    • https://site-1038520.mozfiles.com/files/1038520/20639466109.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/tuvitimagewug.pdfIn PDF document text
    • https://site-1036936.mozfiles.com/files/1036936/kiduteg.pdfIn PDF document text
    • http://files.zulemasummerfield.net/uploads/1/3/1/8/131856290/8c1a62e47513.pdfIn PDF document text
    • http://files.clarawellsart.com/uploads/1/3/0/7/130775205/9412950.pdfIn PDF document text
    • http://zetumug.montaukcandleco.com/uploads/1/3/1/4/131406436/moxofusivedusik.pdfIn PDF document text
    • http://files.stpiusxtucsonyouth.com/uploads/1/3/0/7/130740517/pugamubuvoxi.pdfIn PDF document text
    • http://files.nonstopfunsocal.com/uploads/1/3/1/3/131379268/tatav.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/7a6814d2-3992-4c42-890e-1394b0c64567/gikimeragifozemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecef13c-bbdc-40b7-969e-ec4945e1ad18/3315047751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3ca141-a775-43b3-ac15-4245b2c0cc4a/mireteresozise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a016d3-89e0-4bf2-b93c-c3e57be6f481/13085223850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec6d653-d126-4a37-848a-e8e0a4162cee/lagodazopudejopirumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c284f904-e6e1-47fe-991a-c18854167fc8/xibuberofitimexenulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33ec47f-4b4d-466d-b11d-1d60d8a450dd/86716492688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cfd438-b21b-4501-bf77-8e3857cfc77f/85653343800.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_off000078e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 5292 bytes
SHA-256: d53ffcd7c344cf96fd35f23645291ce26694327746c20ff44e65272662a238d2
font_01_sfnt_off00008ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADE 10280 bytes
SHA-256: e14ee55afff120fe4c0dbbd36c00566a1153000a1caa993d310fea53297a8e7e
font_02_sfnt_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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