Malicious PDF — malware analysis report

Static analysis result for SHA-256 991cd6f30e4d9d19…

MALICIOUS

PDF

39.5 KB Created: 2020-11-08 14:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: d8089102e2077484749e8336ed502dad SHA-1: c431ce56a8f29954e7a78cb383d681c29fc8ead8 SHA-256: 991cd6f30e4d9d19bd452bd5682672b33bebb2b4ba5d31d7202dc806ea6cd820
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?keyword=watercolor+techniques+worksheet In PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/289524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_5fa7a62b52860.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/gevoziwakovigez.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/malidu.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/disizofevupoteja.pdfIn PDF document text
    • https://juximejejin.weebly.com/uploads/1/3/4/3/134365908/1856961.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/2488786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f9855d2eaccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f89b8f543441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fa5bcd42cee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fa419140baf3.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/gafedupeba/regusopexikunep.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_off00005bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 5180 bytes
SHA-256: 9c99084eaf87a5c2e7a239f8394c6c43008b0a808ff8761a68dcfe9cb21cbec3
font_01_sfnt_off00006dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 10532 bytes
SHA-256: a42ca63ae0b621d3b97e1d6b62c5284109c118a79b7f5c14a019122c04777951