Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfc9f13a6e4f703…

MALICIOUS

PDF

66.4 KB Created: 2021-02-25 08:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9641a2872b5a87b8f34cd34d10180885 SHA-1: 639bf1ade05a1b46965f9f4b33af31a9fa75b42d SHA-256: cbfc9f13a6e4f703b534e0bd12af90bb03dbc5e739964b4f6690bc7a0c46aa73
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or malware distribution vector. No scripts were extracted, but the overall structure points to a malicious document designed to lead users off-site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=renzetti+fly+tying+vise+canada PDF link annotation
    • https://cdn.sqhk.co/bebomopakax/jhiilif/wasarugisevaz.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/7659682.pdfIn PDF document text
    • http://euroshopme.site/67655032878wh97j.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/6be16a54b1cd8c7.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/algebra_lineal_grossman_septima_edicion.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/81113825959.pdfIn PDF document text
    • http://dkblogin-de.com/88585330967qrzp3.pdfIn PDF document text
    • http://nudistoff.club/sri_rudram_chamakam_tamil54hb6.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/mFijfZY/teachers_federal_credit_union_holbrook_ny.pdfIn PDF document text
    • http://istlan.space/aadhar_pan_link_sms_formatttnq3.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bgj4jgv/tuvarapa.pdfIn PDF document text
    • http://bilkan.fun/koranimuv82cnf.pdfIn PDF document text
    • http://investmag.org/reviews_of_brother_label_makers_workzwiqj.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/simujix/atmel_studio_6._2_arduino.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/13677866708.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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 5312 bytes
SHA-256: 34e61cf75672bc6102d921e2f32c6c5c8390eba9cf5df42c55dada84de5f1c46
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 10188 bytes
SHA-256: 7b2c71ec9ae4490bd4c2232f99cef22b5345bcb6f5811c81e29848dbbdc23db2

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