Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d8c795ff75fb26…

MALICIOUS

PDF

42.9 KB Created: 2020-11-08 13:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a64693f5fee4ba8c5811daeee90f729d SHA-1: 7bedb7d9b40e08efd7c0170ceeedd067f32e146e SHA-256: a7d8c795ff75fb2684d46bb8a5f7a872efd0cfc9b0f6ea1c00e3b26ff49bcc9a
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=nominal+definition+data In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fa39053ce64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f8dfbde30ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5f93fcf4a81ed.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/fejififimaketo/cuntos_pares_de_cromosomas_tiene_el_arroz.pdfIn PDF document text
    • https://sakazedeg.files.wordpress.com/2020/11/25933203693.pdfIn PDF document text
    • https://meniluw.files.wordpress.com/2020/11/lewexofiganekejeki.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/5349965847.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/tewixabirunisopepu.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/the_things_they_carried_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/crisis_adrenal_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/wuzijokim.pdfIn PDF document text
    • https://zojudekekez.files.wordpress.com/2020/11/wuvuxun.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/chemicals_in_cigarettes.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/gedogevowavivegekalum.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/busbar_trunking_system_schneider.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_off000069f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 4748 bytes
SHA-256: 2ffbce6c587ad58c88145dc01e2cd1cae1bef6069b0400e2ee98859ffa08c27b
font_01_sfnt_off00007a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 10868 bytes
SHA-256: 2df54892534d0345d5e2b07039f2499a889043a26cd3367187e6bd37acb623f0