Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81a2938988b99ed…

MALICIOUS

PDF

70.5 KB Created: 2021-02-27 19:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eb16cb7f18ee9052267902d167e3a076 SHA-1: c748ecd411f58d4247e15009c59a5f26b217d892 SHA-256: c81a2938988b99ed8ac8b22426bd562b330dde456069270606d1ef7028c737b9
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://nipisod.ru/wix?keyword=7th+grade+math+eog+study+guide PDF link annotation
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/zevebug_kewef_betisitevalofem_setazadibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_600769cd69d2e.pdfIn PDF document text
    • http://xxlmature.site/norse_mythology_bookrdbp1.pdfIn PDF document text
    • https://nojokubovurob.weebly.com/uploads/1/3/1/6/131606526/lomovuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff4a57248063.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/nowerufakolopafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490132/normal_5fe4e6c095cfa.pdfIn PDF document text
    • http://wssummer.space/financially_fearless0yxjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_60005a79a1a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5fe1b15ccde2e.pdfIn PDF document text
    • http://auto-agents.space/monotasufuwibawet7q3an.pdfIn PDF document text
    • http://meriline.store/the_natural_history_of_lovelm0cx.pdfIn PDF document text
    • https://rivixajonezil.weebly.com/uploads/1/3/1/4/131437445/558f70ff852c3f.pdfIn PDF document text
    • http://mritzoliver.design/72147560715h4237.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/wakajidilajag.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/lenoberuw.pdfIn PDF document text
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/jelovipozenegi-xirobilosaro.pdfIn PDF document text
    • http://lorenbayi.com/44925519611o22ol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fd098171909c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 5296 bytes
SHA-256: 2f1990a439c0343f0e65f7fd27aa433b9524de06bdee80e96ddce19929ab254c
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10104 bytes
SHA-256: 59d4dbbcc6320a2510080091f52c67e6a7b9e51bc5d5bde1868d2f395c352119