Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75c6d0f7318aa5…

MALICIOUS

PDF

68.0 KB Created: 2021-03-03 13:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a6d281b25f30795efe941c1aefb27552 SHA-1: c31d2f23d32834e6b54179dd55487104e9b47d70 SHA-256: 6b75c6d0f7318aa5876f61a4b760b44d632c770a094f4b76af733552ee2b2d76
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=vector+addition+and+subtraction+worksheets+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fdb5849b02f9.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/rezepinaxirabuluk.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/xeduwifefufu_ropuvepidepus_sodetedoj.pdfIn PDF document text
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/4318808.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/puxujabekisuxe_bepekurulivitir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5fdc7a043d5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_600a56f66b424.pdfIn PDF document text
    • http://douchehq.xyz/16448900673hxw6t.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/vipuxafol/particulars_of_claim_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/39066941684.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/attached_herewith_is_my_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/76640483186.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/38167695345.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_off0000cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 5256 bytes
SHA-256: 915f24a3f3000fea9ab708e87c780d411e0185be5cfacb355346834a750e6bc5
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10668 bytes
SHA-256: 81e74849699ddab39d1173d4b6920168a5a7c445f3b095e437f0d5fa6f322481