Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fda94f055d9cf9…

MALICIOUS

PDF

77.6 KB Created: 2021-01-11 23:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1583efc68ea14dc7367b1ccb16663471 SHA-1: c44ab43883b961c8b7bec1ea8d30c7e6fdea7e41 SHA-256: 00fda94f055d9cf956b8922b7f199b58ceb6ca221230b36ce2e6a5116c47c9ae
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, identified as a link farm and a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the embedded URLs and heuristic firings point to a malicious redirector pattern.

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://traffking.ru/123?utm_term=implicit+differentiation+practice+problems+with+answers In PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/zikatuwozemegebibexo.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/052ef95d54c3.pdfIn PDF document text
    • https://site-1171643.mozfiles.com/files/1171643/sharpened_teeth_before_veneers.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/df9946d4.pdfIn PDF document text
    • https://site-1175521.mozfiles.com/files/1175521/fipewozu.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/GUo3mhj/blocky_demolition_derby_2019.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/5311076.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/vuxekemubokepojapuro.pdfIn PDF document text
    • https://site-1174929.mozfiles.com/files/1174929/origami_heart_instructions_easy.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/xelimewat/56504440615.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/meribojisamagerasa.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/australian_tourist_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/24091891017.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/bloody_v7ma_software.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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 5564 bytes
SHA-256: 75eeff6b0e8b343b6c8992acb72e837f1edb252889552b8d84d9f28f8fc6bc07
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 11340 bytes
SHA-256: b169b988e251c6e500ed06d50d4b4990b535dba1b35d314730f45287a979bdf5

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