Malicious PDF — malware analysis report

Static analysis result for SHA-256 20398898a84967f7…

MALICIOUS

PDF

66.1 KB Created: 2021-02-01 18:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ca8b1049fe68193a09d26f61669be827 SHA-1: 47700ce2b917f82acbad63f1ddea8d85391d6056 SHA-256: 20398898a84967f720bf8de9536f886d4d93cd60a34d1ba309885a9dbf591945
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://jacksth.ru/wb?keyword=live%20wallpaper%20for%20samsung%20tab%203 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5fcbb86889fb9.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/niaTjin/teachers_college_columbia_university_transcript_request.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5fc6b97dc4561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff6259944943.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/abCYjiz/3d_home_design_online_easy_to_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_6017552d04de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_600fce2cd6767.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/7tYAhdK/39590729357.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/e061aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff893297625a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5fd079764f5af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fc7452076524.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/ed6dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530990/normal_5fcd50465089a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fcef66fd2bbd.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/56720e19d916fa6.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/mizeteb/streamline_english_departures_audio_free.pdfIn PDF document text
    • http://vanudedu.epizy.com/84581732049.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_off0000c576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC576 5620 bytes
SHA-256: 7796ffab860f9bbb30855c5d698e7bfd11b7c0067de00ec531f68d64e2c00624
font_01_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10172 bytes
SHA-256: e1266aa759ffcebd6d27a6295887b57aea03097a612aa9edb6d744594959c1f4

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