Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece0d61d2331e69a…

MALICIOUS

PDF

77.0 KB Created: 2021-05-18 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5a8f00eca917c08281273bbc46942635 SHA-1: bb80b1388c6a3c57575f77946c1ee4eedc9d26e8 SHA-256: ece0d61d2331e69aa1a1cc1678ddec555fdea76f8330683a9e400f2a2a8fc7dc
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 dafemum.ru. This indicates an attempt to phish or deliver malware. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL is sufficient evidence of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=what+are+carry+on+restrictions In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_60005c4529e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_60600b44200da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fdde2ccac404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_602270e27c8ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471095/normal_6008b878c82a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_604f7b2721d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_6019322f66bf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fe14ed3cb3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_602641c50cba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fe702dd67b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_600eaaa8cbac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5fe60bf46044d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_602da3499fb40.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/fd5bdc34-1861-419d-b323-435ce3455a24/what_is_the_importance_of_text_structure.pdfIn PDF document text
    • http://bulanorimene.rf.gd/hautbois_girl_guide_shop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc635651-7235-4165-9d5d-5fa20154a8d2/tefavelorar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e2d283-7d86-4212-b05a-5681eb3d942c/74629290746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3421931-ccaa-48d8-ab5c-feba52151f31/how_to_calculate_instantaneous_speed_given_time.pdfIn PDF document text
    • http://bozusofofutuv.rf.gd/gcuf_degree_verification_fee_challan_form.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/word_search_puzzle_game_answers.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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 4972 bytes
SHA-256: 4728db147180fdb4bb4b8830da1dedebc388ac262f82bb8c7e3470e21887850c
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 11252 bytes
SHA-256: 3c599f1d3903ea8f9f17cbe86733643a7981b4bc0ed1331976b780bc9d3c962f

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