Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ef1b87b141a338…

MALICIOUS

PDF

66.0 KB Created: 2021-01-08 09:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 766420da50f2b0e08c1727c0018900e1 SHA-1: cd08bbca3ef2bc3d46179b04aff98bd789180a10 SHA-256: a4ef1b87b141a338e45ca84373b214482f6e8901ed954476e0188d058e57fd23
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URL and the document body suggest a lure related to a free business textbook. While no scripts were directly extracted, the PDF structure and embedded URIs are commonly used to host and deliver malicious payloads, often involving JavaScript execution.

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
  • 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/aws?utm_term=understanding+business+12th+edition+free PDF link annotation
    • https://cdn.sqhk.co/nanovinojon/gfggia9/wutipokamise.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/chcgiji/63543521361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f8c526198cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9b0d3a9576e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8fa032483ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fdd151f918fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374207/normal_5fdffe8fba3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd163cfcbff7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5feece8cdd022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fc77330d5bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_5fd1d12f36699.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/hhSrhiB/3d_sandbox_game_for_android.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/0b7a2d2d-f737-45ad-8121-97ea8daca8e6/metodo_del_rectangulo.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_off0000c4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A9 5452 bytes
SHA-256: 24850bfa3a40bd77d2b7a07b524c584a47d3203ef3546f0855596aa5b9b4b10d
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 10536 bytes
SHA-256: 4fa02c1cfc57e65f273c758f6cb72e5321bc66059a70db55f8f40998236e6585