Malicious PDF — malware analysis report

Static analysis result for SHA-256 780e97fdce477fc0…

MALICIOUS

PDF

71.4 KB Created: 2021-02-21 17:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f7aea2cf362895f257cd2bbf7e523748 SHA-1: ecae07456f79c79759525ce9c386dccf18db2c03 SHA-256: 780e97fdce477fc0751931f3debba72c33b95e9b5c283616586162d5cac5db2a
144 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=inorganic%20chemistry%20housecroft%204th%20edition%20pdf%20free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd2aceab1e63.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/dYQNhbc/42418882985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_5fc9c26bc65e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_601a5bd177009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5feb4e3d41955.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aX6HFlm/mini_pocket_bike_racing_engine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5ff64a27cc6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_6012c5129f89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5fe20fd091f26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ff0dd964b916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476007/normal_5ffdd0bae4602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fec5003eac77.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/jezekemunidup/14377914310.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/architecture_resume_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/small_single_brushed_cotton_fitted_sheet.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/challa_uri_song.pdfIn PDF document text
    • http://zasuzutan.rf.gd/2043354449.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/coursera_financial_aid_questions_and_answers.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5664 bytes
SHA-256: 0797072e6b8b5b113dd7a7f8f4393a89c8794846360c328af16329a9001139c2
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10648 bytes
SHA-256: 4ec797ec58d838ee94a266dac91f429a56bd861fc6c41e109298cd97b6adf879

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