Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8b8c31f31e3a90…

MALICIOUS

PDF

48.5 KB Created: 2020-11-04 17:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 3afac2b2344d482080e22cbb1a80c19f SHA-1: 963ca8158fe5b9b6e5008e7f0c5312c8d046f30a SHA-256: 5e8b8c31f31e3a90d7dd6287082be064186e83613bcafb165a14c4f6a18b508e
202 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/123?keyword=motion+to+stay+writ+of+possession+florida In PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/7c4feac12e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8d3b835c5ca.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/5535287.pdfIn PDF document text
    • https://sojizekupiguj.weebly.com/uploads/1/3/4/5/134586608/4235194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fa06997cfc47.pdfIn PDF document text
    • https://wezukanedipewor.weebly.com/uploads/1/3/4/6/134602888/22a6655.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007def.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007def.bin)
    • https://s3.amazonaws.com/levovod/becker_high_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0112e711-1014-437e-bb86-0989dbf8ec81/bejeravilaxeramurukupos.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/sc_state_guard_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/lubaxojotitu.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/ash_blonde_highlights_on_black_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/carbanion_reactions.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_off00007def.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 5232 bytes
SHA-256: 0083482cc512d644b9e90e5b8d0804b058edda2db2e7a5377a8135af6b1e1338
font_01_sfnt_off00008fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FED 10840 bytes
SHA-256: 9f65e629038465768e3832f443d77b571aa7d1e6e57b73d1f7f2bd3d15e44eb4