Malicious PDF — malware analysis report

Static analysis result for SHA-256 91451be6209dc876…

MALICIOUS

PDF

70.6 KB Created: 2021-02-27 04:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 85624feac2891e071ebbe04604f8d29e SHA-1: 223c6b61c8f0a2e014bd4e2cce45eb7d54c7448f SHA-256: 91451be6209dc876fc7d96b2ad9bb64d59304a4e0b2160aa2df3bbd832271ddd
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=distributive+property+of+multiplication+with+arrays+worksheets PDF link annotation
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/xozasizuketag-fujudosebup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5fd275373fa8c.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ojcii2f/90206601018.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/91iiijT/62333885118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_60258cca00498.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/0LieZhf/final_fantasy_tactics_war_of_the_lions_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fe90b92e7c18.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/6jjTeej/remok.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/jihbLgd/stick_war_2_order_empire_game_download.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/jirebonudur/baldur_s_gate_enhanced_edition_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/aim_csaire_discourse_on_colonialism.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/92576834211.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/somubefakalelesuripu.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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 5712 bytes
SHA-256: 9036d7441ab4224e8d3482e3bf6591728ebe1b0dd5dc9adca775bc1578b93874
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10992 bytes
SHA-256: 44688308464680ccf1632e6cafb9de5c056f6501c5408a7cd143b8f352cfeadd