Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d03355e622aca…

MALICIOUS

PDF

66.3 KB Created: 2021-02-26 03:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: acee087bab2ffc9fae87ecc6ed1ab03e SHA-1: 8ff9af6aaf6a654a3b9f8f415573ca0fb58527db SHA-256: a33d03355e622aca9a8c90035181de8cd95783455901fd4b417bb8e110e6e122
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=decomposers+worksheet+tes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_60325ba5a25af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_603835b7689fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5ff9d79766152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60108a70c4984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_602f8c6c7c31b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_60335d835eb79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fe02b1959c57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_5fe4e927434be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5ffbdd0b39b9e.pdfIn PDF document text
    • http://zerkalo-fugicar.website/64161272487weq1r.pdfIn PDF document text
    • http://fenellalucynelle.info/body_parts_worksheet_free_printableskalyj.pdfIn PDF document text
    • http://reetodo.online/miravevupovekutifefibadoemt6.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/zufaxepixiguxax/43442023281.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/meeting_minutes_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/facility_preventive_maintenance_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/suva_ergonomie_am_arbeitsplatz.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/fologisiweworurodu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/83236062342.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/10019219913.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_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 5088 bytes
SHA-256: 4d685416c007c4e60335ed5b633bed06582404c82cb84a27bf33e680cef2626f
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 10108 bytes
SHA-256: b511c55330734eb98e8a5a5c387f9e53d264d0f6c7d7b9d2afec23b370a365df

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