Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4663d87236a7abb…

MALICIOUS

PDF

70.8 KB Created: 2021-02-21 20:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 51c0a65010cf9448077ee6ba91089d55 SHA-1: bf60af8af351cb95e040a50ecaaf3b28d9b56e2d SHA-256: c4663d87236a7abbbac451aab545b2553b780f93dd08e3c8e5b520455e544844
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=manual+of+emergency+airway+management PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fd7a99a7a50c.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/ja9Btgj/24708329737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_60290ad1e1e96.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/Hihkhhp/homemade_scoreboard_basketball.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a92d3631e.pdfIn PDF document text
    • http://matteset-spon.space/cars_2020_suvrw6gb.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/geMuRCN/end_it_now_summit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ronenitevodo/82576870083.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/iso_9001_revision_2015_risk_management_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/australia_student_visa_questions_and_answers.pdfIn PDF document text
    • http://jakunivejejaxo.rf.gd/acadia_hospital_bangor_maine_release_of_information.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/86150871313.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/51737879228.pdfIn PDF document text
    • http://tijepexaran.epizy.com/investigations_math_grade_5_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 5104 bytes
SHA-256: ad0cd4daccc3aa8eccd5c35c5912cb84e8dcedc9655cfd7701309f91d48debdb
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 10800 bytes
SHA-256: d389aa2c0771a2a6627945d198f2f3352148da7a695b665429c18c2ab2210484
font_02_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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