Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a156a9066fd3de4…

MALICIOUS

PDF

69.8 KB Created: 2020-12-22 06:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9d75de2c42f5cdc39ca25984c171fd0 SHA-1: 5b3ce3231e0b63437804d2de218958e1e4334565 SHA-256: 4a156a9066fd3de4db6930b009a82971445e29509b4e21aaae583faeb78799f6
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of a malicious URL suggests the primary goal is to redirect the user to a harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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://traffine.ru/123?utm_term=ck-100+v99+car+key+programmer+instruction+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5fdb54a3e08a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fbf56f9a5845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5fab670678178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fb59d14378ec.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/9570699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fc9c6d6414f5e352379fdb1/1607059162551/pumpkin_smash_derby_2019_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/chordata_and_non_chordata.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/4946947967.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11cf00a2757459be424fe/t/5fc2ae93bc819f1cf4308f21/1606594196534/holiday_city_toms_river_nj_zip_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37863f59a2572d8ffde5/t/5fdd678d7185ee572d31f7d7/1608345486242/kozijikidalozulanoge.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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 5768 bytes
SHA-256: ca90277f66950650dedac504e262556a52d3d47d2fd0415930c0c512684bd5a2
font_01_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 11696 bytes
SHA-256: 99ecb511d3b5ed506d2c01c38ba6dae0deef8b666d2d129c6520483629fb3426

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