Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a766892788a749…

MALICIOUS

PDF

68.7 KB Created: 2021-01-28 13:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d44673fb54c8eac2dfc841aee56d9ed3 SHA-1: 9474716e318322d0aeac26d0c9838940f849f4f8 SHA-256: 87a766892788a7494bc36a011a24efc3f906b2ce23d32bde69c6876e172c0225
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=epic%20war%20tower%20defense%20mod%20apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446382/normal_5fd18760ebb6c.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/movuzukexom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5fdab8ba284d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409998/normal_6005144b24931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5fded6bc58450.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/0d8f5e19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5ffe2538af14b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_5fdfdbe1a9503.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/375d89ad73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_6003272e51fa3.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/xmRjAjh/free_likes_on_tiktok_no_human_verification.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_5fe1d1f43c8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fe87e3ef236b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_600b4cb5f2da3.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/nojemi/61226638115.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 5384 bytes
SHA-256: 9388ecfb122df157c6f301f3fe1c25fa198056d0c0bd1b809024fdd902162763
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 14588 bytes
SHA-256: 2c5e036e4257e810b970a1d2651e137ec24c422d03b2abc89dc72e93aceabea1