Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bb4580eea9c30c…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 11:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 057bc0696f05e2444b6cd64518fbed30 SHA-1: 210e434b001b47470f555cc6b12aaf5e82e01f1e SHA-256: 43bb4580eea9c30cfb678283089ed3abc610e7a9d85958bb57e4241d7f2d81cc
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=how+to+calibrate+ge+cafe+oven PDF link annotation
    • http://flash-sar.online/21906607075x6dt7.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/gicVgdF/wedding_salon_internship.pdfIn PDF document text
    • https://zexonozanefamiw.weebly.com/uploads/1/3/1/1/131163740/sonifaperurev-dobiv.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/gjajh0P/skin_among_us_god.pdfIn PDF document text
    • http://uaportal.site/35263804152c08y4.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/687252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_6009bfdf3562d.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/2868835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5febf00f9673c.pdfIn PDF document text
    • http://remontnatali.ru/libros_sobre_el_reclutamiento_y_seleccion_de_personalddix4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449604/normal_6024047b90307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415534/normal_5fcfaf02e630f.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/topujuvopo.pdfIn PDF document text
    • http://love-your-lips.online/2020_subaru_legacy_manual_for_saleuueiu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_602468fd273c7.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/Shbgiid/what_color_tube_do_i_use_for_cmp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvigewe.rf.gd/lovenasisubo.pdfIn PDF document text
    • http://tewilojejesuj.epizy.com/fha_appraisal_checklist_form.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/how_to_calculate_end_date_in_excel_excluding_weekends.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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 5124 bytes
SHA-256: f158e390fc9d3e7e83a6c4d60349c2fa0ad442a0f8cdd4d76de97a3c53afa970
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10828 bytes
SHA-256: f630c66a6d3398901dce1edc1e023d24aab7a75d085d198b30305151f5742bc1