Malicious PDF — malware analysis report

Static analysis result for SHA-256 e921ab214273b8e9…

MALICIOUS

PDF

79.9 KB Created: 2021-01-14 07:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d103d3e01a6f9d51e5088fa08d6a751 SHA-1: 7003c5867789e534fb9796e0a724e50283d05cd0 SHA-256: e921ab214273b8e9a796f11b69c14b94631385e676fc6052c6eb053d928098f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. ML classification and ClamAV also flagged the file as malicious. The embedded URL is likely intended to phish for credentials or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=deik+vacuum+model+ev-660+manual
    • https://site-1168252.mozfiles.com/files/1168252/litivividumawokibanes.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fb2c81e27747.pdf
    • https://cdn.sqhk.co/vuxeneson/brgyjcd/gekofumifidowakon.pdf
    • https://site-1168429.mozfiles.com/files/1168429/teacher_salary_nyc_with_masters.pdf
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5fadace4c7c78.pdf
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f952bb8cba60.pdf
    • https://site-1171656.mozfiles.com/files/1171656/education_verbs_worksheet.pdf
    • https://cdn.sqhk.co/kefesizo/0Iwjihf/74061709272.pdf
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5ffa3174df03a.pdf
    • https://site-1196452.mozfiles.com/files/1196452/piano_chords_for_beginners_happy_birthday.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8834dd002d9.pdf
    • https://cdn.sqhk.co/jebumujo/g0ifEbM/28414208733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vudivuzakal/prentice_hall_conceptual_physics_workbook_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb43.bin
4e359618c89d38ad3f6308287577135f9553177924e7aae535bfcd8a2b636522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 5264 bytes
font_01_sfnt_off00010d2f.bin
752c2495ac9b0389966445cf97f25f20a9d21a1959003df23f0091e9ef8801cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 10948 bytes

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