Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3230e2ba7fda34b…

MALICIOUS

PDF

85.1 KB Created: 2021-02-01 11:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bdb6b788151e17a85ae0af484c79634f SHA-1: 0163780f805c5ff1ccdd92ca0a3d4c98ceb2d2d9 SHA-256: f3230e2ba7fda34b71e8715a2f51f89fc34e04792f7a6a72955261ce22b8b50c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://yafferge.ru/123?utm_term=pure+substance+has+same+properties'. Additionally, ML classification and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=pure+substance+has+same+properties In PDF document text
    • https://cdn.sqhk.co/kinifukix/ikic9qO/monster_warlord_error_105.pdfIn PDF document text
    • http://pomevufe.22web.org/38677205283.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/jbDXIna/57890746304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd6258ed77c0.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/gy71Xhg/kiss_sms_ringtones_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woberiz/binary_powerbot_free.pdfIn PDF document text
    • http://pabaxonewopux.epizy.com/top_battleground_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/administrative_office_procedures.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/delulegumusodoladusesuxud.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/26847031252.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/74245991152.pdfIn PDF document text
    • http://vumijasi.epizy.com/amazing_bike_games.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/carson_dellosa_spanish_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/sibuvodu.pdfIn PDF document text
    • http://ruxevomim.rf.gd/jebom.pdfIn PDF document text
    • http://butadiviwev.rf.gd/hf_acid_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/72637979340.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_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 5284 bytes
SHA-256: c9014560c41cdd0edd4646318dce4438ccfb44323aee7274c8ee4ecaf20a8b10
font_01_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 11396 bytes
SHA-256: d241693c8107694586022c1e42bafe6e0b25bc97bbc85141b789733aad7343dd

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