Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf57c5f4a76a1b…

MALICIOUS

PDF

66.5 KB Created: 2021-02-17 20:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 921ac8098b5f214cb815698c11851eb3 SHA-1: 91497992c6efce2e167e5f0c8883433eeb44e914 SHA-256: 99bf57c5f4a76a1be85c0115a3704008c458154f59420bc5eec8cd59556a3034
194 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=famous+bobson+boti In PDF document text
    • https://cdn.sqhk.co/tumupowe/haiazgg/63902114283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5fe4ecd5e223c.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/iggcDpD/ichoice_smart_pulse_oximeter_ox200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5fcd9e091ccc0.pdfIn PDF document text
    • http://netlysy.online/debt_service_coverage_ratio_excel_worksheetsowbs.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/TBhiji7/lost_at_sea_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/cQigygc/bubble_tea_boba_balls.pdfIn PDF document text
    • http://megahit.space/aesthetics_philosophyahexv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fdddeef052da.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/jjeMtgd/foxalutinudunironeroso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_6026fcb7c3862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_5fdae5620f2cd.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/jajeyhj/mexuwumerexelolokezuzuxe.pdfIn PDF document text
    • http://akb54.ru/genatulurikudeluzajezizev2kmun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454430/normal_5fefd9cf0510a.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/bulolimepol/batman_arkham_origins_gameplay_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/xobud.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_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 4800 bytes
SHA-256: 867ccdb46726895a6cc9a4678e81aaefec581676e0c72603f037b4667d0f2c50
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 9468 bytes
SHA-256: 1e80191c4a11d8048a47a52fd3ebb022a9f68457bbbcd3138d9c8355994cf66a

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