Malicious PDF — malware analysis report

Static analysis result for SHA-256 0058c90816c1ae9b…

MALICIOUS

PDF

67.1 KB Created: 2020-12-10 00:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2ead49f0a9de567c62f2cadc9dfa302b SHA-1: 19891caf832436f37c28e203dfb6fe8b72601996 SHA-256: 0058c90816c1ae9b1b93e7104d964ef26ced2a957bef4d9a25f8a2bf3eba83f9
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://traffmen.ru/123?utm_term=the+student+leadership+guide+pdf'. This URL is likely used to deliver a malicious payload or phish credentials. The ML classifier also flagged this PDF with a high confidence score, further supporting its malicious nature. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/123?utm_term=the+student+leadership+guide+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fcd29488a047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_5fa808376c66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fa72b179bb9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fc2af244a33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5fadca6a52aed.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/5fc06b0d2e537a05ef0695ba/t/5fcf970657846c5b835c42ca/1607440134439/82248470471.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0d117acac6192a87df2d/1606290708916/10246382143.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b295abffab30daadc730/t/5fc9ea1d41142a3c4b41d06d/1607068192366/call_break_multiplayer_card_game.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/76751706594.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/pdf_to_word_nitro_download.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_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 5252 bytes
SHA-256: 294c948c2df68b9ff252b10e5c46baf4e0133e194953e772f0354ae4da6c3d73
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 10600 bytes
SHA-256: 8b1b41bcf49ead494be802173d62b2709b97506e84db715b7a65e2ceac25cb06

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