Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a933e453c9b920f…

MALICIOUS

PDF

67.7 KB Created: 2021-02-28 09:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0cbc484d906f1f9aa9644e3d2952b0d6 SHA-1: f8bfba69fbddc26f7fd3b275653a5d01a848aeab SHA-256: 4a933e453c9b920fea7c5f7903e3d7c1ba34de8f0c42764929a5b7f5ffab2f48
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=cakewalk+no+sound+from+midi+keyboard PDF link annotation
    • https://cdn.sqhk.co/dudugetogi/jdejaii/names_of_domestic_animals_and_their_sounds.pdfIn PDF document text
    • http://yourcy.com/motasulek1yug2.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/gB5gdJO/ringworm_looking_rash_on_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/gojaxaxiwa/ixjagfK/go_transit_ticket_validity.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/rofibakum_ramax_fezugegobatuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/ia6gehx/27653696802.pdfIn PDF document text
    • http://winoorama.fun/zedabo42aam.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/j6lgfkq/mevubifuzulitekobesejede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fd9db7685e0b.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/legesiliv/39507303873.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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 5356 bytes
SHA-256: fa372846c3f188587d3caa3e3fa75ef0c53f32e1b54b07ba0334876e5c48cd19
font_01_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10188 bytes
SHA-256: 6457ddbd9290cedb0f12c1bff964e31509dfbdeef148c8bf2a35c7654e31f5e3