Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f78401fde35f7…

MALICIOUS

PDF

70.8 KB Created: 2020-12-14 23:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38cd7e5fffc6f351249e9da69c525ccb SHA-1: ea220d59af14e214057db4e98f89af6a8de800bb SHA-256: a24f78401fde35f7fd43a9f939a30eda2fdb38f7f545dce47ebe1eb28c67ba96
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafffi.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'statistical inference pdf solutions', suggesting a lure to trick users into visiting the malicious URL.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=statistical+inference+pdf+solutions PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51393485235c86bd0862/1606373690448/wonder_woman_cosplay_diy.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/navorivevo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/iisr_worksheets_final_term_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/tarewinifogeworobetunowi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/free_layout_templates_for_mvc.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/a_couple_pieces_of_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/anna_karenina_bangla_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/joy_to_the_world_unspeakable_joy.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/pokemon_rumble_u_haunted_playland_challenges.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/79480539320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07c2511-0c3d-4f8d-bf1e-50c29d4aaa5f/redeem_minecraft_code_windows_10.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aebbb8467722f1dfa14b/t/5fc5780d145a8629dc6b77f5/1606776846404/tweco_141i_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/nadedumipozisofiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3aa4a1-a98b-4a50-832d-09a63d3af54b/nifitidorububidolamisu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pajefizugexiretuzebapin.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 5252 bytes
SHA-256: f0e4ce0918d44ea06c5074e13193ceaf6e9f06d82e5fe1b9b0d6a3c02f372d13
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10808 bytes
SHA-256: 917e54af4f56a49641ab6c8ce8b0000b84a18691d5d44e980989e8b4095d729d

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