Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e504defa8c342d…

MALICIOUS

PDF

67.7 KB Created: 2021-03-02 19:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb2722d7777d8f8b186e9973e37cc31b SHA-1: cf8690d3b9c5bb8f0ab701d63aab39b073a2060b SHA-256: d5e504defa8c342d07c537a7010cded7ff3fda4d7fb13951f4ff271d1acf5777
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://gimoguvi.ru/wix?keyword=determining+domain+and+range+from+a+graph+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454426/normal_603e660c761b0.pdfIn PDF document text
    • http://dunizajo.66ghz.com/accident_prone_zone_information.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/motejixupuxixodila.pdfIn PDF document text
    • http://vijoxufomodazug.22web.org/wijirupadesaluku.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/jjEc6Q0/jagirupurafotoxador.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hipjggg/crush_them_all_best_heroes_2020.pdfIn PDF document text
    • http://edarudost.online/ejemplos_de_monografas_cortas_para_secundariapfu7i.pdfIn PDF document text
    • http://eu-study.ru/mechanics_of_machines_cleghorn_reddit6vuzd.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/troy_bilt_edger_tb554_wont_start.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekubox.epizy.com/hagley_oval_cricket_ground_pitch_report.pdfIn PDF document text
    • http://pulupalu.epizy.com/sitonofudifu.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/20471122643.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_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 5576 bytes
SHA-256: 932bded4d5279bdca4d160668535f920fce9896a1b7cfbc610be2670a8c2372f
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10076 bytes
SHA-256: 89fadd9919a70f4e78f2d01962ed5bd0a1aa6290238e0aa1fb8e3c2a21e62af9

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