Malicious PDF — malware analysis report

Static analysis result for SHA-256 257fea23fadc5375…

MALICIOUS

PDF

70.1 KB Created: 2021-02-20 22:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 2b3b33f6248c5441687b0ad96545ae86 SHA-1: b30cc8e09c3a3e830eb600f1f5b0d5029896dc92 SHA-256: 257fea23fadc53750b3a602715ed0ec8cc8fb449a36d275ccbdad9fef3439d9c
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://maypoin.ru/wb?keyword=proform%20performance%20400%20treadmill%20dimensions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455207/normal_601850208c78e.pdfIn PDF document text
    • https://cdn.sqhk.co/lepapina/dgjidjb/12460054346.pdfIn PDF document text
    • https://cdn.sqhk.co/pesunexaxak/ihie7HU/baguwijabewujumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_602f7eec3ebfe.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/c59145b08ede1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_601808d87cb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_601b6c85f0f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_5fe6788d8aee9.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/hbhduZQ/disneyland_paris_annual_pass_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5fe7a02a8814c.pdfIn PDF document text
    • https://medefali.weebly.com/uploads/1/3/4/0/134012737/8a75cbcb1b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5ff89cc8ade0c.pdfIn PDF document text
    • https://xidabasexibure.weebly.com/uploads/1/3/1/6/131637276/vowon_liwap_vuvenoguzizoku_dopovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5fdbe09d1fa13.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/d6bbe38b26748ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 5532 bytes
SHA-256: a4c69988686cb6bb7fc89e95887e28d0498328dbb7ce1d6f019039e022a92ef3
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 11268 bytes
SHA-256: ea552eb1fb273a9bb989aed12c1c289803062b0a2e259e578efc8171245d7826

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