Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b14317ea6c3cb2…

MALICIOUS

PDF

76.3 KB Created: 2021-02-20 20:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ef7d26824d4f3d65deef2c69a24274f3 SHA-1: e6eecc6962cad4a4b48dfb15a02b5825ef008f77 SHA-256: 21b14317ea6c3cb2f6ef6fc9a4244cbbd282026c9fad6ad089d9c464cbe66c1e
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://maypoin.ru/wix?keyword=glencoe+health+chapter+7+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff2944757dda.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/ks3_indices_worksheet.pdfIn PDF document text
    • http://grampus-shop.com/mewozobirusixqfl6m.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/rixigeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_6022411eac8c2.pdfIn PDF document text
    • http://storeplus.pro/dell_precision_4903174n.pdfIn PDF document text
    • https://tukevepa.weebly.com/uploads/1/3/0/8/130814993/6673120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5ff8a2f70f167.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/gexebik.pdfIn PDF document text
    • http://smartline58.ru/2077972207au088.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/norozovijalu/sujekinirorevoboze.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/atlanta_bread_company_catering_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/13009270982.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/67091968964.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/tuwowafasez.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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5224 bytes
SHA-256: 77ae5be567b8f7b565c92dc4f5cb21f19feda76f26285ca99cb3ac8e9b7f50ff
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 14080 bytes
SHA-256: dbfc7cba86643ac6c50f7c04ad50573c3fcb6d3f75a6ed289acc0a1fae43fa5c