Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f914a0b8692e78…

MALICIOUS

PDF

68.2 KB Created: 2021-02-15 08:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8611afa496782d01964f430747e21ad1 SHA-1: 7964a52d0869e4c976734c0532d3f9cb99c4691a SHA-256: b4f914a0b8692e785e293d2c80603a429f6a18fd8301aaac9b79f7e3dbd72711
244 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=alpine+ilx-+702d+android+auto In PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/d67af08b24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fc617471d62a.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/2899788.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/impihUW/brain_training_games_online_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/g7VpCRm/12542873504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_60000d1f98a74.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/nggdjfi/tuzozuwarotolag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_601fab52d9038.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/hjlgeoc/88211946065.pdfIn PDF document text
    • https://tefakunuti.weebly.com/uploads/1/3/1/8/131871494/wererow_mosizes_xapefu_kujaludetaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvozosasubatib.epizy.com/wezusumabodubisoz.pdfIn PDF document text
    • http://ripijinev.rf.gd/sapna_choudhary_video_song_mr_jatt.pdfIn PDF document text
    • http://dafotefadi.epizy.com/how_to_use_reportviewer_in_mvc.pdfIn PDF document text
    • http://gugujis.epizy.com/59922952869.pdfIn PDF document text
    • http://bixerexexotepe.rf.gd/wawulupupitapaluwagerogip.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_off0000cde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 5220 bytes
SHA-256: cb038b8f0b441182eb819e0ce9b263d56dc3c7d523c767dda539ae3caae67c0e
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10764 bytes
SHA-256: 74bb1dc2005c9f7bb7964f42451fd3e8bd5f0cbedfd1a0aa9680fa62fa405520

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