Malicious PDF — malware analysis report

Static analysis result for SHA-256 d575b5cfd587ae92…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 17:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c975073cfb5a7258ce6faea326f45d87 SHA-1: f3c26b81b5b0d9a3bcf70ec98d70871f91f9a4f1 SHA-256: d575b5cfd587ae923da65fae41a38f1c35702f481dc2cf50ea69bf3d101077c8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, indicating it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=will+there+be+a+sequel+to+tintin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd15209c032a.pdfIn PDF document text
    • http://freud.icu/benzyl_chloroformate_toxicityezi94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_60510d5e40015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_5fd70e26615b4.pdfIn PDF document text
    • http://investmag.org/kegisovawi9vhwc.pdfIn PDF document text
    • http://heartcenteredequestrian.com/xikefisita2xlv1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6012250c8d4cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_5fdfba42920c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_60004e942b088.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/excel_multiple_regression_analysis_and_forecasting_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5fed3affe1aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_605043e3091a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6018e606d4c79.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/steroid_shot_for_shoulder_impingementprmpa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4047e33-2d12-4363-9067-aae5db55cd26/how_to_delete_ntuser.dat_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d69436-9a5e-469d-94f2-ba978ac725b4/how_to_make_a_leather_knife_sheath_tighter.pdfIn PDF document text
    • http://jizivaj.epizy.com/29820193126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ea5e6d-93eb-4cd6-8635-a23bb0ecbe85/70955685598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243fbbca-8482-4401-a1eb-08365dc32ffb/best_english_learning_books.pdfIn PDF document text
    • http://pexevogawi.epizy.com/bapatik.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5052 bytes
SHA-256: c0bd09230df800546c85057f86cf124b7316b0941cd65d00634a432187b15ad9
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 11224 bytes
SHA-256: 57d104e6637508a6e874501f13d4f488eba0e739a48871b0cae0173e3bdc97ba

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