Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd3f8d11c88e60…

MALICIOUS

PDF

72.9 KB Created: 2021-03-01 16:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ebd06f1b86a8abc79f05da234dc4a25 SHA-1: feb2223bbf4cc502f11410bd57865767b4f16af9 SHA-256: c9dd3f8d11c88e60e7ce4964d32b3a0835605d6c10ef438d900cbb03221123a4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though partially corrupted, suggests a lure related to Spanish verbs, which is likely a pretext to disguise the malicious nature of the embedded links. The presence of external URIs and the link farm heuristic strongly suggest this document is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=lista+de+los+verbos+regulares+e+irregulares+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453719/normal_60224a5a5a920.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/descargar_tipos_de_graficos_para_excel_2010.pdfIn PDF document text
    • http://setlyb.online/construction_management_fundamentals_2nd_edition2tegx.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/the_sims_3_generation_serial_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_600544b42897f.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/34516024337.pdfIn PDF document text
    • http://xxlmature.site/is_ryobi_a_good_chainsaw218om.pdfIn PDF document text
    • http://trickyturkey.com/zibanusevevabbn15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_600040091e071.pdfIn PDF document text
    • http://rotelebi.22web.org/literal_equations_coloring_activity_answer_key_football.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/55642652921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzonulegi.rf.gd/sulonetisatudisopeveva.pdfIn PDF document text
    • http://visifisaduz.rf.gd/what_is_the_particles_distance_from_the_origin_at_t__0_s.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/10973239425.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 5480 bytes
SHA-256: ba1f9dfe917f49bf78b53682207e3b3ae3b648a12af410d2c76b62c2851aa4bb
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11224 bytes
SHA-256: 8a8c8877b21bed0223e734f9d39f7afb0d210e955c4a12ffb60ca835902aebaf

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