Malicious PDF — malware analysis report

Static analysis result for SHA-256 4331527d1712bfd1…

MALICIOUS

PDF

80.8 KB Created: 2020-12-15 10:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5b0cf932abebda4b06634cf4de87d2b8 SHA-1: 5fe7684116fb22baca56acbea90c36cc09b8a789 SHA-256: 4331527d1712bfd14a63281afbce01821d8074765c139830e6121fcc3c063b2b
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=hawaii+public+school+calendar+2017-18'. This URL is likely used to lure victims to a malicious site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/123?utm_term=hawaii+public+school+calendar+2017-18 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_5fad2efdad400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fb2d592e2043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fcfef27290ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5f9d1a586a4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9c41bac7d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fb9fbe780089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc97a70c59b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fbc8816a9db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5fa93421860ff.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/gajabedafot/historia_de_la_bandera_del_peru.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 5988 bytes
SHA-256: ff401b62cd8ca7918dd829b4c8e44427eb8099e602cbcfc4fd9a56073bc16851
font_01_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 10916 bytes
SHA-256: cda9113e761e47d34b82b2534f577033bc0631c12b25987421fcc1acdd41808b