Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33b0f308a960b0c…

MALICIOUS

PDF

65.4 KB Created: 2021-02-18 16:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a2c1d622ce68e9d8c5b660ebb1479bdd SHA-1: 72f0247e1a3e7d8ba339e1466de62b75fb59b1c8 SHA-256: b33b0f308a960b0c59a783d54013d71d9b7783bfc2bd47906f2b0c0b2a6de958
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://baarspo.ru/wix?keyword=vocabulary+workshop+level+g+unit+3+antonyms+answers PDF link annotation
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/1247529.pdfIn PDF document text
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/rujikug.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/82272898620.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/9719800.pdfIn PDF document text
    • https://cdn.sqhk.co/senepaderu/iR6v51o/19015838795.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/giwihig/contour_meter_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5fffd56f3e08e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff4c0c70b55e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5ff33a1d87d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601e01c15f604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450337/normal_60020096445a1.pdfIn PDF document text
    • https://fojokelimavame.weebly.com/uploads/1/3/4/7/134713907/bufilerijemuken_jifawinisat_zoriji_rutoloxunorupag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarajemewowin.rf.gd/fudefo.pdfIn PDF document text
    • http://povuputuk.epizy.com/adharam_movie_songs_free.pdfIn PDF document text
    • http://mexexumekevuk.rf.gd/16733812468.pdfIn PDF document text
    • http://kikivalisexe.epizy.com/android_app_bar_background_color.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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 5932 bytes
SHA-256: b29bc34d290bbddf7c21beca70cd2a85f6d0d664d1ff2ec2cb8f9c39470ab82b
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 10156 bytes
SHA-256: 35e2d646846161df8f548e6417a8db55e18948fa0880aa99539b062048c5b381