Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f5867f9acc666a…

MALICIOUS

PDF

39.3 KB Created: 2020-10-30 20:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: e765632bdfd0d0191c6fd773b1c779af SHA-1: 3eb9c05fe1849221625f45cf908cc1f54f78c597 SHA-256: b9f5867f9acc666a67fe12c2fa74e16f98e85298a71ee1059d3f7c2c052685de
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=monatomic+ions+practice+worksheet In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/04c1f34.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/3219319.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/bisexerataj.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/64e4f302557.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8bf7d87bed2.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/kerapawenojup.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/6841339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f8bded326001.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/9ba13.pdfIn PDF document text
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/2564156.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/8074942.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mokivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/13200835854.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_off00005b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B10 5300 bytes
SHA-256: cc6598a8f84567feff961b4437a58ef99d1342366ad9988121ae32802d470013
font_01_sfnt_off00006d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0C 10372 bytes
SHA-256: 725952bf56d9927ec612ededfb1d5e3033f4d9fafabc9d8a72a883c9ac75c212