Malicious PDF — malware analysis report

Static analysis result for SHA-256 9653e454fbae1fc3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 02:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c525b118b42ce23499793c944283cb98 SHA-1: 1f58fcdb068327d32d09dfa2a8a8b5c2fabc1582 SHA-256: 9653e454fbae1fc314918388a71bd5f805b9e5cb0fc1ad1a9b4ddb8bdd2c8eb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://pelibifir.ru/123?utm_term=what+is+list+-1+in+python PDF link annotation
    • http://kalidejomepajo.scienceontheweb.net/how_to_study_life.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/fomizixemodozas.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/plantilla_excel_gratis_para_tus_finanzas_personales.pdfIn PDF document text
    • http://sqrab.top/mujisnpcui.pdfIn PDF document text
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/385c1ebf.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/fawigajitamibujefimiwasiz.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/hhpVXfO/lamazalodiw.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/vabemipafizat.pdfIn PDF document text
    • https://cdn.sqhk.co/kejalupegem/5K5hhjd/dining_chairs_modern_upholstered.pdfIn PDF document text
    • http://jokebixa.22web.org/40829284176.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/poxazesojufixev.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/dgeifja/nexunaturexog.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/8368871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilifujajug.epizy.com/employment_application_form_word_template.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/80075742323.pdfIn PDF document text
    • http://buguvisidobudis.epizy.com/asus_xonar_dg_si_driver_windows_10.pdfIn PDF document text
    • http://dufapojemuju.epizy.com/cisco_ccna_200-301_en_espaol.pdfIn PDF document text
    • http://riremim.rf.gd/expand_binomial_pascals_triangle.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_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5012 bytes
SHA-256: f80ee67b44582fd41806fd2e5f69a91da7492791bb7c6594d2cbf16a06b58eeb
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10848 bytes
SHA-256: ebba54fb6e3c5fbd6ec7b70ecb36b5bd0f7e98e78883a88463dbe1a20bb03b92

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