Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd392fc849589eb…

MALICIOUS

PDF

67.4 KB Created: 2021-02-11 14:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: e952afed5d1d1e4cba1db2a62d1b6b45 SHA-1: ebd54d1e0ab0355b9090f1b609829cbdacdb0504 SHA-256: 9fd392fc849589eb592808f37be3461b5992f48de4a769fe3eaab974aad475e1
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wb?keyword=letter%20d%20duck%20craft%20template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fc68cb1893b7.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/iQOgiji/vobisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_5ff10cce2cdfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6011fdd8d569c.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/luwegaropowab.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/gihdBUw/pokemon_heartgold_extreme_speed_dratini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fd06bf1932fc.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/gjjz9ha/nekojesajugowutejawilasob.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/i4Uhiif/suvele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_601b86a578b18.pdfIn PDF document text
    • https://xexibufit.weebly.com/uploads/1/3/0/7/130739933/3461594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5fe55dd7c3487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fdfba865ad0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6015d9c449c7b.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/nWETcia/1228023877.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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 5128 bytes
SHA-256: fdc996b11232cfe2f223c581e626663cdabcf41fc1a4a88f9124383494c1d0c1
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10136 bytes
SHA-256: 841b572d6f0d24203a9c5cd992162fc86203ff1694e336e96e2d5dfe38320dd7