Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7aa6166315987b4…

MALICIOUS

PDF

69.4 KB Created: 2020-12-23 17:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b8c559a5a069bbf7c0e7ab3aa58cce70 SHA-1: 3309b4131efd2debe72dcee5d1423a1a18c10041 SHA-256: d7aa6166315987b48cea2713b19fefd0ca4960746ad813a833b2c82c8c62926f
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 'https://traffmen.ru/strik?utm_term=reverse+packaging+aav'. This URL is likely used to redirect users to a phishing page or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to 'reverse packaging'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=reverse+packaging+aav In PDF document text
    • https://cdn.sqhk.co/kefexunas/uMieAji/zugipoliveriki.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/34hiygi/nowuwuzurowutakodek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fccd5dcce4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_5fd810e5693d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8895ae8846f.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://uploads.strikinglycdn.com/files/d6e9021d-1eaa-4c8d-9c08-d620002d2be8/26275580972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1674de72-53e3-4c9e-8bd6-b3fc958acddf/67288527151.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/3346337850.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/medical_laboratory_technology_methods_and_interpretations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8929ec37-c1d8-4294-80c4-26160a86a1e4/duvifajitasufajiniriso.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/personal_income_statement_and_balance_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 4800 bytes
SHA-256: e2c1d040254806397659a7bca5d6c633d6747ac1269be2c7f3f0e2a70bdcd9e7
font_01_sfnt_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 10508 bytes
SHA-256: 752c2f031bbe82385fe003077620bd5d4828fdd4eb60424c706aa0377e4f86e1
font_02_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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