Malicious PDF — malware analysis report

Static analysis result for SHA-256 908210f242e1c90a…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 12:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9850b6e661a2191f151272047aada8c2 SHA-1: 731aac90d1e9927b72f0839c96a50433d897ee1b SHA-256: 908210f242e1c90a8a06e66121e7e67a5e12fcb65d646a7f30bcb6a86807dd5a
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://baarspo.ru/wix?keyword=change+font+size+in+yahoo+mail+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fcd2d61c4f78.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/3673647.pdfIn PDF document text
    • http://copyright-securityx.com/zozevudesadacjq6.pdfIn PDF document text
    • https://dumugukof.weebly.com/uploads/1/3/4/6/134647937/gixibizudojeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5fedfc012cd38.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/7108467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_60070cd439e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_5fee8c485f4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_601b8d9d99d72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fe239495c2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_6011447fefd69.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/1005571.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/koruwo.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/warapagefasovi/34508538288.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/neonatal_hypoglycemia_sri_lanka_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/lenaropi.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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 5276 bytes
SHA-256: 1b8ce396ca1bddcff9e262979ba9147d58211a595cfc15ffeb293fd7b8ac48bf
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10212 bytes
SHA-256: 796bda030c98e5bdbde6eeabb48bfccc3b57fdc18cc4f7d326757e8b38310ae6

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