Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c09992f11ecc17…

MALICIOUS

PDF

73.9 KB Created: 2021-01-01 10:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 15ec3164c9a31231eab2f33a250d5ee8 SHA-1: ba23a017f04a2dd5f597b18454f9077e33719c6b SHA-256: a2c09992f11ecc17298c241602d002efe58ef4c9d4b987168b96c62a35b62d87
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a review for a coffee shop. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the embedded URL is the primary indicator of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=mr+coffee+cafe+barista+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f873c4cef43c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fe49c76b93ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5faf17ea586d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_5fa94d38ceaa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fdf38d07e46b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1652e99090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b1e999-1d36-4786-9cb3-ad031e940e66/brier_creek_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb504c39-d6e6-4417-b14c-5ede9451e2a1/84771762796.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/fanireg.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/94985733966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86d18ed-e5f7-4e4b-a121-5e0c21120131/medibang_paint_pro_download_safe.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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 5140 bytes
SHA-256: a62dcd08973b460d57246d650a1aedf446d173cb9aa5d83e86d8bf05e4708f40
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10720 bytes
SHA-256: 06259db9e9c06403a0949541ad3271e4b8f38389aa8a2b74fd4e7a1910de7d2c