Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bc6b18a3340015…

MALICIOUS

PDF

67.3 KB Created: 2021-02-02 19:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 40efc8d21752d0442861bf2e1e0c99df SHA-1: 5c78dde6ac6d0c408d1cf9d29cc6cc72d5e36001 SHA-256: c3bc6b18a33400150f903511787c22766644ff764986f5268dfc709f39dbaf41
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/wb?keyword=hindu%20calendar%202016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_600b2041ebe19.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/7167704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600bd823c12d8.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/d155c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5ff8de2b93545.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/329182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd5fa3a5de59.pdfIn PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/7245768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_600919503557d.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/jidosatikim/23632635303.pdfIn PDF document text
    • http://kuwopugivowivo.rf.gd/anatomical_planes_and_directional_terms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/pusodisakeluren.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/westworld_full_hd_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/kudefoguvaxiluwejef.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/82595078193.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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 5196 bytes
SHA-256: 8f58dc3bb4f8614d0f391867b14102b8ac227af1f16e452f3dbf8ff053094f4f
font_01_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 10336 bytes
SHA-256: 474eba5e0c8f07cba79c18d1403918cf0fb4528102db679dae0ad332def175c8