Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91da5f26d803617…

MALICIOUS

PDF

76.5 KB Created: 2021-02-12 01:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 96f8a2560144b0a81a91c14c83e7ba57 SHA-1: e83c45b47cc1eff1da49a9dfad3c7a9178c0babb SHA-256: c91da5f26d80361799b30823dc1c187543016f6ab68b4d52c742a75492e29ff1
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=mark+1+iron+man+hot+toys PDF link annotation
    • http://j3vnci4.xyz/89266889886m4g7q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410441/normal_5ff7ebf25bfe4.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/gihdjij/border_light_app_download_uptodown.pdfIn PDF document text
    • http://bestrongbyg.com/itbp_telecom_answer_key_sarkari_result5o663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600b65505de7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5ff22e9498f05.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/h6iifgc/vovaparimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fe331fe46ff2.pdfIn PDF document text
    • http://it50life.pro/99313443254lcgic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_5fd6ed6f6438f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_6023d52de274a.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/mamibis/opera_web_browser_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/construction_company_organization_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/patefigakovexewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/supevoroju.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_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5116 bytes
SHA-256: 2ca2167c728983014a17b22f1ff6e6139b85896d92c7de5640aabb2d73909d40
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 10608 bytes
SHA-256: 2a7143e6ede365ddecf83c1c188a37b2b3f76488fd40cd5f582dccf9bbcd3ee6