Malicious PDF — malware analysis report

Static analysis result for SHA-256 b430b92ea855e5c5…

MALICIOUS

PDF

80.2 KB Created: 2021-02-28 23:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ce3756ba1135be910f4ec82ea1d61cc7 SHA-1: 200bc7ee47c759c770c578c1287654961da09c61 SHA-256: b430b92ea855e5c52f52f43e2f297def619816770bad130035990029493d38be
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI and an SEO redirector link, disguised as a geometry cheat sheet, strongly suggests a phishing lure. The primary IOC is the redirector URL, which is likely used to host or lead to the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=geometry+cheat+sheet+triangles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383308/normal_60088dbbcddc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_603541964de77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fdb62a397ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_6010a28eec936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fe30f4cdbaa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5ff90941a50a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fcebbc12b8f8.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/av49itg/pekoluzas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffb28a2c65ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_601338df61b9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fc72a4b475ac.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/how_do_you_describe_a_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/iijhheR/zomikojozepedinozufemono.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/igRjaji/92356966430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_6029860083b18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5fe4e9e27b389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_600e763b0ac65.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/1148692751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_603550e6605f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_6000e663a485b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 5344 bytes
SHA-256: a4383c983538859319457632b6605743f651c1c1d7be10517c1a594f7a2a6748
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 11288 bytes
SHA-256: dc7eab170b2a13063b8ca91a22416b3af1bcea725df6deddd7909731815eb280

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