Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f3b283cb64f67a…

MALICIOUS

PDF

43.0 KB Created: 2020-11-07 22:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 5e24ccf61c176728a547addc31278536 SHA-1: 1ce8558490b7de3d0a059bbba35adb867be88061 SHA-256: a1f3b283cb64f67a609bb29d58f81690927c8e5374592c3ea29b3a8444d8471c
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=open+24+hour+check+cashing+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fa297cd384aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f88ff2dcd3ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f89d5fa82a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f918e3482e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f890ad7e8aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f943d832cc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5f999fefd9513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f972ba3b663c.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000068df.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000068df.bin)
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://zasalekuvine.files.wordpress.com/2020/11/medical_certificate_format_for_maternity_leave_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/52151466392.pdfIn PDF document text
    • https://wuzemasotiwa.files.wordpress.com/2020/11/geneligojumotufitujoleno.pdfIn PDF document text
    • https://zadireru.files.wordpress.com/2020/11/88723242797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791e15f5-620f-492b-b103-ec33f20012be/gta_flying_bike.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 extracted file (font_00_sfnt_off000068df.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 5624 bytes
SHA-256: 4fca7e3fc8d7773e0f91c86fba8d331f48233c75728a5e930bb314f6dd7671ba
font_01_sfnt_off00007be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 10196 bytes
SHA-256: 645c792dbeaaebc47ad8327353f0474a6d1170a6085d918c7ffcf80377dddf6d