Malicious PDF — malware analysis report

Static analysis result for SHA-256 121e0cdb594d20a7…

MALICIOUS

PDF

73.5 KB Created: 2020-12-24 15:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 580eaabd6f5b27694fd04fc74367d928 SHA-1: b3a11af9ee99e0c07ddef4201524f4bf2e6054a6 SHA-256: 121e0cdb594d20a79dad0f38a107c3181b0b0137cefcf07578e782a5cc575396
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for a PDF redirector link to a known malicious URL. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cctraff.ru/strik?utm_term=dungeon+archer+run+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8706ad0dc71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fce90650b432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f90de6e26ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8753cd1bd7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tenunud/spatial_geometry.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/78433976261.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/topirijafekilejib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6999ef-ba00-4426-a395-bda4551dbb45/lotoratosejijixixir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc8c22b-8e95-4a72-a0ef-8d7db0fe9de4/att_samsung_galaxy_note_5_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44b3c66-2ee9-4b61-91df-971c671aa850/taylors_video_guide_to_clinical_nursing_skills_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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 5088 bytes
SHA-256: d73ce2e53f04bca1079e9fd1c3d935aee24cae269aa80d83741ec14639471af5
font_01_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10240 bytes
SHA-256: d58338308bccaed0efa75db59fbe14453fe88241c81d1a0579d8606d0ddb3c62
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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