Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cfe0e18d249d8b…

MALICIOUS

PDF

70.8 KB Created: 2021-02-26 05:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f3d325e0b61d49b39204b3f201bf4472 SHA-1: 654e3fd3f902dc661d3ca7c5e841361657902ebf SHA-256: b5cfe0e18d249d8b96b7a757e9bf8a0e43ecc3f8563aef985fe19fa241b50d12
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=pretty+moon+phases+drawing PDF link annotation
    • https://cdn.sqhk.co/zezoxomop/a2Rhjge/coloring_books_cognitive_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/Jiib0aP/64776742887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_603371c582124.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/gi3bt05/castle_story_walkthrough_roblox.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/3436843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_601a42cc34a8a.pdfIn PDF document text
    • http://sosixowadisi.iblogger.org/residential_building_plans_with_dimensions.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/L6ifK1k/fitness_ball_exercises_for_back_pain.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/9f6m55M/71585850023.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/biekiff/superhero_that_runs_really_fast.pdfIn PDF document text
    • https://wawedubogefolik.weebly.com/uploads/1/3/5/3/135391715/kisalewu-dixileboku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_6013a0c223115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://libizutuxe.rf.gd/tuminasuzuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 5324 bytes
SHA-256: c952fee359eecb6eaebda1c8518e4bd8f559b72a4c5826a38ac90e928a957df0
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 9652 bytes
SHA-256: a5657532f2b644c4bb431ad8473719a5fa5580e68a6af6011722361990e1b2a9
font_02_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361