Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac57812997619b5e…

MALICIOUS

PDF

45.5 KB Created: 2020-10-04 04:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 77867bb82b235025b32f2b48692a91f2 SHA-1: e7df12a2f7e5c2898ededb2ea3646f454136711b SHA-256: ac57812997619b5e895ef201f26fe3699bb7496784fe8605e760e8c99d601221
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=gmat+official+guide+2020+ebook In PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/60579164081.pdfIn PDF document text
    • https://site-1038519.mozfiles.com/files/1038519/89573701402.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/66208035853.pdfIn PDF document text
    • https://site-1039898.mozfiles.com/files/1039898/kabimifupenolojopug.pdfIn PDF document text
    • https://site-1039538.mozfiles.com/files/1039538/46358327582.pdfIn PDF document text
    • https://site-1036898.mozfiles.com/files/1036898/67599007280.pdfIn PDF document text
    • https://site-1040984.mozfiles.com/files/1040984/jegenazabiliwuvifa.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/16205753762.pdfIn PDF document text
    • https://site-1038488.mozfiles.com/files/1038488/93634524979.pdfIn PDF document text
    • http://files.treeoflifeinternationalchurches.org/uploads/1/3/1/4/131406434/zisorev-vixib-gazen-gunawowevi.pdfIn PDF document text
    • http://kemara.bunioncenternyc.com/uploads/1/3/1/6/131606165/durafuragu.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/5dc9af95-a307-467a-b0c0-b5e6891d5ee1/dupenelisurukiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7178ed2f-b80a-43db-8f57-a599a953c798/dobezeluwexoravujiwilowox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8006a0-1ce9-4bfc-9903-20388497835e/vugapam.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_off0000654c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654C 5352 bytes
SHA-256: 807f0fea9580b292deb8f65eb5e7b36bb9f488d9748c697cb133ee698787219b
font_01_sfnt_off0000778f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10392 bytes
SHA-256: d9ef0af99b23a52e16523e7b70781baebe7eea0f6b77aff2a65c5e4f4d2c6516
font_02_sfnt_off00009b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B19 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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