Malicious PDF — malware analysis report

Static analysis result for SHA-256 667d181cba873314…

MALICIOUS

PDF

69.7 KB Created: 2020-12-19 17:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2ae6281e20806b32c9f17b75c450ddd5 SHA-1: 86b406feafe80cb2e2cae31550f4e22a7e0d6fae SHA-256: 667d181cba87331451dc3b2d15ebec27a98db7a06d8d7306dc8e0fdf26ae1aac
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a federal firearms license application, aligning with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=application+for+federal+firearms+license+atf+form+7 In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fa0284b0a913.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/rilatodab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f98712026136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f954420e9b7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea36f7cf8c75402afe56/t/5fd2118ffec2791e310dc4e6/1607602577373/fodiza.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/game_dev_story_apk_1._2._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4bb69d-e7ff-4961-98ec-0a1602e58970/wirefamomavene.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/lurovifetavofewiduxejede.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/free_construction_cost_estimate_excel_template.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_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 5372 bytes
SHA-256: 4b8828f807e1d08c7aa80d3e092a308020bb94a57d7589e974c1b6bd80a0bc56
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11560 bytes
SHA-256: 7534d79201920a68ee9bf2713147fb9eed6491ee869726115b17cdebf5d89d6b