Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f255503292e8e3…

MALICIOUS

PDF

58.3 KB Created: 2020-11-20 11:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ced8cc3a874cca3a6c3164d2c0b8823b SHA-1: 1fc33b1d48cc66aaae3562637fe04a0de7f8d54a SHA-256: a5f255503292e8e3bbc240a20950f6bb3c126af73cbb8b47360981db4c5ca680
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=punnett+square+powerpoint+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5faa00d8cc21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fa8a2b97761e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8b5b6fb8d88.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/luxelula/97826097253.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/xodusukeburefinavepuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c6aaa1-c047-48c9-bd28-d2d7ba9faa0c/63050270184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f005a52d-cb85-46d9-a099-66ec42dc5cd3/gimijulomobofusajuxogofin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e338177-7e6e-45e1-a69f-e754da286254/53098485990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817c0b6c-cfb3-4310-bf37-06b1c569b1ee/dilusolaximigig.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/microsoft_dynamics_nav_licensing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390d41f0-e50f-4945-898c-6d0a3903c6c3/54751724180.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/28608350614.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_off0000aa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA14 5532 bytes
SHA-256: 14c60edf0549b26d3caf37f7e829c61ff2f0fc43d6eb8682b57f2d610ffe84da
font_01_sfnt_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 9324 bytes
SHA-256: 8430646f6e3221edb4e47bbe0a3c084fb1416a4500f3b121edd38ac59438f528