Malicious PDF — malware analysis report

Static analysis result for SHA-256 e574b7b1fa9d85ee…

MALICIOUS

PDF

78.0 KB Created: 2021-04-13 13:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe7f4250680c64347da7f93b9e9640a6 SHA-1: 40bc5a333a9f6dbb4e1ad41b61f04f169b047c2c SHA-256: e574b7b1fa9d85ee518a0d4e8b64b8a66dfcaeb899cdbcddc1f365cb248e70a7
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to distribute or obscure malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=who+is+thucydides+and+what+did+he+do In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_60545ae70b8a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fe2640585f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_606ddf37982f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_606c0df9f2185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_6063fa231d4bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5ff7ba3bbc443.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/dovulavavo/jual_al_quran_online_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/modul_akuntansi_keuangan_menengah_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6761a8d-c72b-47b5-b261-8826a5bedae6/84126509010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760445a2-aea8-4787-af3e-c0de495c3367/heat_and_mass_transfer_fundamentals_and_applications_5th_edition_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/best_keto_recipe_book_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/gabutimufepuwurogefula.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/chromecast_disney_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/wills_eye_hospital_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3065f56c-cdf8-416d-af19-4aac8ea2f33a/wazamajazedubumiguxixo.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_444cb44d9f8b4b41884dba1b56c4c1ac.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_f9dc62b4c8224615a9cecd3169d1252d.pdf?index=trueIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_c964995e8d2a412eb8747b6f363f6754.pdf?index=trueIn 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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5104 bytes
SHA-256: 4b0eefa31e659fcfa35227ac62bec6bb1fe790c46b7eb3f11c37a00cd8d7e9a1
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 9928 bytes
SHA-256: 81ff5310624520557255ec60c21ab6bdd6f8a7ba36bf083033b211e46b474cd9

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