Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e806b5256b43597…

MALICIOUS

PDF

38.7 KB Created: 2020-10-13 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d62a551ac9d6ef14d278e2723aef9856 SHA-1: 61aa9a827ee94a6c9a2032f3a0cbeb77a44e9a00 SHA-256: 5e806b5256b4359761b9c7b611ce5dcab627a024f4a4878a30d04df65a5fbbfb
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=yds+publishing+english+hood+a1+a2+pdf In PDF document text
    • https://site-1041785.mozfiles.com/files/1041785/gabaw.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/29812002651.pdfIn PDF document text
    • https://site-1040997.mozfiles.com/files/1040997/88663338704.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/63878575697.pdfIn PDF document text
    • https://site-1038844.mozfiles.com/files/1038844/durimikev.pdfIn PDF document text
    • https://site-1038691.mozfiles.com/files/1038691/11741406446.pdfIn PDF document text
    • https://site-1041865.mozfiles.com/files/1041865/62289825636.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/jepijekomeji.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000057ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57FF 5492 bytes
SHA-256: 6b1f5185c363f3c11ff415b947634c9aa19f70d00b35f3f490362e683abb24fb
font_01_sfnt_off00006aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAA 10804 bytes
SHA-256: 16756bda41982bf1e8ff48ef0f9b427c60d3cd1496e877ee66fdfc5e8f3bd8e6

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