Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39817441f794bcd…

MALICIOUS

PDF

78.4 KB Created: 2021-02-13 10:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 8a4abbd9210856142502ff14348badab SHA-1: c2aab7b4c9fa392f4f93bd6c9541ccd15d0c8dd9 SHA-256: c39817441f794bcd743eb4c7b44fb13df0ebd67a84e204a19d581eca70a52905
136 Risk Score

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://druttle.ru/wb?keyword=brain%20puzzle%20questions%20with%20answers%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c802d5e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fe1a19c92623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fd15312cd394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_600184ade1c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5fec06ee11c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60151c4a4a1aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_600bf0b759842.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/jarawaxanivu/gijagukizukox.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/wupepikolavuwogititid.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/kemonifotazisipoweg.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/38989632410.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/33400762528.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/ligamento_de_treitz.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/android_vs_ios_2018_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/itv_news_meridian_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/zurusa.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/nikakokariwetujoko.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/riwuregoximenitat.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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5444 bytes
SHA-256: 3af7eb3f99bbe020746b69d6d8473de3aa4c8065f867c38c4c488efbce89943a
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10212 bytes
SHA-256: ff37f1bbaeedc66503cfc70aa701e3094c334d3a2fec3c5ee88b79b626baa3ea