Malicious PDF — malware analysis report

Static analysis result for SHA-256 920f25751a8e915b…

MALICIOUS

PDF

37.3 KB Created: 2020-11-08 06:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 0ca4a281bdf21b8563ebd5002441f2fc SHA-1: e8ea80aaa8ff1b150766ed8cd9d6f4bd70f26892 SHA-256: 920f25751a8e915bf752acc7df28a4be7611aef9d868a31283e271f60290e44a
136 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.
  • 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.
  • 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=life+cycle+of+frog+preschool+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5f9788f0d3d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f88af4c28f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f98490e38cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fa757fc3f72a.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/1696759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f9a0ffc729f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fa46c9c9d6a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f8de12c5f7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fa6dd8eab04d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f9b07b75d66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fa5a9fe93ce7.pdfIn PDF document text
    • https://vopumatibu.weebly.com/uploads/1/3/4/4/134402560/polosepifawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.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_off00005301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5301 5264 bytes
SHA-256: d5c267387e4e3fe8ad72196d38ea53ee1bda15effd3946189a112794bee2c0fb
font_01_sfnt_off00006513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 10416 bytes
SHA-256: df22dfb82fbb647a809802dc90eb41458516344dab255c2beb13b1fb024f06e5