Malicious PDF — malware analysis report

Static analysis result for SHA-256 b837519972184c46…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 15:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 5d28e0703e1c0c97392c6dc1907282fa SHA-1: b5978348442ac104e54ce1c8366b5cd4b3e32a94 SHA-256: b837519972184c466e672053e387328e35f11b87b3ff5ce8717650f79d7622cd
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://resalured.ru/aws?utm_term=cuanto+es+3+centimetros+en+milimetros PDF link annotation
    • https://cdn.sqhk.co/pisomuma/igiKQzO/kurumitekujizeno.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/pevux.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/jbidwgj/profesyonel_siren_ve_cakar.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jigjl81/knife_throwing_target_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/8hjijib/dizefajef.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/napoledunadigo/sirufakudafexoka.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/7990891046.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/22965423753.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/adorno_para_el_rbol_de_navidad_manualidades.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/8849797683.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/majijugakonekejejatefige.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/behavioral_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/93337627790.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/pinulewunijol.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/riseribitelerasefol.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 5016 bytes
SHA-256: 1841f507147a66201dfdb3f58e302be557729a9f0564b1ffae6cc47c1792945c
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 11820 bytes
SHA-256: 514f664a4eab2e90ce845fd2ec764330629ed67c2428a9e7c3018c24b5c51bca