Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c89450d0e46be8…

MALICIOUS

PDF

75.1 KB Created: 2021-02-15 12:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a98ab2e938c888c6418cc9984c49dca5 SHA-1: 54f3f745fe50707429ba89468db58b214a5eb176 SHA-256: 53c89450d0e46be8541b13f2263d7f70c4578bb9738b870c143b02cdcf9eb516
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam campaigns. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a precise attack pattern beyond link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/wix?keyword=watch+true+detective+online+free+season+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fe6a497b6081.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/vofej-zusoweduzaziwuf-wubemigu.pdfIn PDF document text
    • https://nokabukewodujam.weebly.com/uploads/1/3/0/9/130969525/910ada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff4da8eb7251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_6015161665326.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ice32v7/punebugefi.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/rujesosixilorokas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_600008b6a9324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5fc9f994f093c.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/VheuiaW/teachers_salary_in_cleveland_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/nifii8e/parallel_coordinates_plot_python_seaborn.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/2399981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fdcc72460426.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/bitajemisajoz/45362082478.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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5236 bytes
SHA-256: 55e5b7245902cbb28b10817bb68906b77a141c6540f54f60b54c0d6a24e9e96c
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10824 bytes
SHA-256: abe752387bd68a936322052eb3161b624f834d0ad6c476fa27d30f6f06cd0f84

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