Malicious PDF — malware analysis report

Static analysis result for SHA-256 685a5449a55b6138…

MALICIOUS

PDF

73.3 KB Created: 2021-01-27 22:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 044c9f6bb902f798613bf7bb41def827 SHA-1: f61a939fe30e9a0fd4c77d9fd11f8bcede28e41b SHA-256: 685a5449a55b61389e3a15499c873826fc675e7cb8de5a55e08277dd526fafb3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF that contains a link to known malicious redirector infrastructure. The 'SE_CLICKFIX' heuristic indicates that the document likely instructs the user to execute a command, a common tactic for social engineering attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://cctraff.ru/wb?keyword=server%202019%20remote%20management%20tools In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fe487ea2fcca.pdfIn PDF document text
    • http://kengoru.space/juwuzajerudegudin2ugdq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fccb9e9ea984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490722/normal_5ff76b17d9be6.pdfIn PDF document text
    • http://uplrezina.site/planet_fitness_age_to_applyu7xzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fdce3050bf79.pdfIn PDF document text
    • http://mivetys.xyz/5_year_strategic_business_plan_template_ppttajl6.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/t5WDggz/orange_candy_slices_cake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5feeca087bac3.pdfIn PDF document text
    • http://futup.ru/36581483826tr0ua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fd34ab047bb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lotawovuvowuk.rf.gd/7582405387.pdfIn PDF document text
    • http://robogotut.epizy.com/47443473547.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/a_thousand_years_piano_sheet_free_easy.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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5648 bytes
SHA-256: 3d432ee9a8449a9b13e304a760c6713d7c0f6455be4a1c3b296b517b7e5e9b7f
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10396 bytes
SHA-256: afb035817da9bb5d6fdc3e6909609843707f4020e0fa6c628f63cbb502a28399

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