Malicious PDF — malware analysis report

Static analysis result for SHA-256 725fda58085e6a3b…

MALICIOUS

PDF

68.6 KB Created: 2020-11-10 07:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f8b4c6d90ddc526a9cee60e3ec2265fb SHA-1: d6fada44b64e68ccb9b4a6ffbf7c36ed08b0fffa SHA-256: 725fda58085e6a3ba000a0da603f1d105b29e34d0dfaf9a61c2c49cbf52fe38a
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to a known malicious redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links. No scripts were extracted from this sample.

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://cctraff.ru/strik?keyword=welcome+to+the+hunger+games+thomas+sanders In PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/1873000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8a311d0b84d.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/derazuzipit.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/pojene-mowuz-laveb.pdfIn PDF document text
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/bafalipiva-gaxik-pojifoke.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/3208457.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/4b0f8f9662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8b5fe68be5f.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/muvarelo/55883197106.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/26211395986.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/56691467609.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/coconut_fiber_used_in_rope_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/fasting_lipid_profile.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_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 5364 bytes
SHA-256: 0c00bfea3445e1caa0aaf25f0b7e5b59a496dae23a9acb8452338bfa50615d5e
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 10704 bytes
SHA-256: 0ef9708ae4dce0c4e2d3d6e90bb3ccce3cb8d4c7d597f82b49649585a47b65bd

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