Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99e67ddab68b767…

MALICIOUS

PDF

69.5 KB Created: 2021-02-10 22:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 989043c089ea2cea922d2c606419f71d SHA-1: 07129f0a38833714ac2aab10744d464ab1dee853 SHA-256: c99e67ddab68b7677eee2c9278f3254a8fbf1ad8fab6fb8de9aeb88d129d19e6
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://seumenha.ru/wb?keyword=time%20calculation%20excel%20sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5fdee5717a182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5ff255c75354f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60138c3f817a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_600f8ca15348a.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/putim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_6004c2233e5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_600eb0f4a9c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_601b724fe5b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_601a57d5c9c77.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/332274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_60124a343966b.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/5e42cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5ff508ce792f5.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/retisovojor/88822023463.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/43162914005.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 4960 bytes
SHA-256: 945a566e3abc53c8306ca4c3f7b3ce1aae17e613b34a1ed2cb6b79cad9c8b5ac
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 10488 bytes
SHA-256: 316f0aa5ea2f6914f8413eefedc714e9ce7037b06656140acfbd000f030641aa