Malicious PDF — malware analysis report

Static analysis result for SHA-256 113c2f88b9be7e86…

MALICIOUS

PDF

72.1 KB Created: 2021-01-03 02:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff6e310cfce56021cd6f557703a85bc SHA-1: e77092ff9b142fb5a1f9d8b1308c6d19a1acd313 SHA-256: 113c2f88b9be7e86ede338c169a916af71af1e5947f312506d4497679a8a0293
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=livro+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+municipal+pdf'. This URL is likely used to phish for user credentials or download additional malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=livro+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+municipal+pdf
    • https://rorekejufekate.weebly.com/uploads/1/3/0/7/130740186/worigavi.pdf
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fda01790eb0c.pdf
    • https://cdn-cms.f-static.net/uploads/4495858/normal_5fda6b6977e81.pdf
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fbeebbc461d9.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_5fbc403fce5f7.pdf
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5fe8f8ab24752.pdf
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/4d95e0344.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutezigojuxi/m500a1_nko_pretest_answers.pdf
    • https://s3.amazonaws.com/gajabedafot/auto_key_programmer.pdf
    • https://s3.amazonaws.com/dusubonifu/zokufisojesatovusa.pdf
    • https://s3.amazonaws.com/subud/21402442052.pdf
    • https://s3.amazonaws.com/rupatojuko/datagrid_celleditingtemplate_wpf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d6.bin
0666f05dd56a33bab9e69891ed4d925ca06a13232897a6225828f93cd9ebb852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 6060 bytes
font_01_sfnt_off0000ea56.bin
218cfe5e9e1c9273eb2adf8d832ca88ff7b8caa5ae2ff54c534ca42522ee13f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 12812 bytes

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