Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5cd20e9b6cfe47…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 16:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66776eb6fd8e2eade249a05292af79fe SHA-1: b5e4675b9b436f0468167b89f0bd1d43fa4d8985 SHA-256: 9d5cd20e9b6cfe479e3658e40bc6c6c6a1ca8d71502a12296b4697ad85042ebe
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for 'free-download phishing'. The ML classifier and ClamAV also identified it as malicious. The embedded URL and the document body content, though obfuscated, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=convict+conditioning+1+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5fdc557ea09be.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/bgfjdTL/ladaguwij.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/ih9sjig/75209408563.pdfIn PDF document text
    • http://wonnaturila.space/gay_porn_myvidsterj6jgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5feb9aaa2ba58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366050/normal_5fff7eece3090.pdfIn PDF document text
    • http://mgacessoria.online/reduce_free_download7k5v2.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/ii4wXja/wivapoviboxorib.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/n61Pljj/73616574711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_5feeb7ed666f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5ff4ff581ca11.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/ijThaMG/lamekafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5feb4144b2dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee67b791409.pdfIn PDF document text
    • http://everydayy.fun/regitadap9wgrw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602566ed5ca15.pdfIn PDF document text
    • http://ver-alex.website/957716584259yids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_60142d2c69a3f.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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 5256 bytes
SHA-256: 30358cbe2eca91dd3ab05059a4784baabe92f76015339155aafdf69f75883db5
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 11044 bytes
SHA-256: ff75507d6f987473ddbb3342e9d680050376d35baa53476dc86344c704e046fd

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