Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc94273e20a1b0d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 18:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f744e95b48e64453ab878245c00c15b SHA-1: 662ac6353a5981eddd463bb1311d0d0f646497f5 SHA-256: efc94273e20a1b0d2d7107e9f40489d924c0c21faa25d841d82897099468550a
154 Risk Score

Malware Insights

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

The file is a PDF document that contains a link to a known malicious redirector. The document body, though heavily obfuscated, appears to reference a service manual, suggesting a lure for phishing or malware delivery. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/aws?utm_term=kohler+7.5+ekd+marine+generator+service+manual In PDF document text
    • http://tifiwijewek.iblogger.org/domojijibiputim.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovixewin/eJm7aig/dwell_and_slumber_knock_off.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/skin_burning_sensation_on_lower_legs.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/similarities_and_differences_of_apple_and_orange.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/moduxanakuri/kabir_singh_movie_movies_counter.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/bojabu.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/presto_pressure_cooker_canning_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/crystal_report_13._0._25.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/ejemplos_de_minutas_de_empresas_sac.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/97857340746.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/confidentiality_agreement_template_uk.pdfIn PDF document text
    • http://gafodix.myartsonline.com/36428331410.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/actividad_epileptiforme_concepto.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 5684 bytes
SHA-256: a9c6c9644eac2f4c520dca35e11a5b4498c4da3a7f22e1ee547d9a0a8f84cc3b
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 11680 bytes
SHA-256: fa65cf67e6b865d5bd39b1f7d8fd5cd84205563e858bcd7daba793d5f89c8ba5
font_02_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16088 bytes
SHA-256: f1368e0d82604bf55bb40b01ac61c381dd14042cff43d793d5e70c6199447dc1

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