Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d834fea3b5f4fb…

MALICIOUS

PDF

78.6 KB Created: 2021-02-19 01:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c6cbfe39bef4a1f6301ab9a5bc588b44 SHA-1: 5b8991e5771f9f36144f6cbf3f69b1c8c2bf6340 SHA-256: f8d834fea3b5f4fbda1ad6fc7325f91b8fde7eccdbcdb82ba8582bdbdb199e46
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV and ML classifiers as malicious. The document body is heavily obfuscated, but the presence of an external URI and the high confidence scores from detection engines strongly suggest a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious link.

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
  • 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://leonvi.ru/strik?utm_term=hydro+flame+furnace PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378381/normal_600cf6381b475.pdfIn PDF document text
    • http://toppiksnack.xyz/ratufisakagifnuk7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5feb07aa3de61.pdfIn PDF document text
    • http://getchambre.xyz/kimuviwht2ra.pdfIn PDF document text
    • http://arendagg.xyz/andhra_pradesh_state_board_textbooks_freepzn63.pdfIn PDF document text
    • http://winoorama.fun/cassandra_clare_books_free2y5sw.pdfIn PDF document text
    • http://oyuncuxx.com/603304502142xut1.pdfIn PDF document text
    • http://leoidet.xyz/80764820571x1nr2.pdfIn PDF document text
    • http://thedefenseforge.com/305460295240hstt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_601a648013a9c.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://s3.amazonaws.com/nemafu/king_size_flannel_sheets_with_cats.pdfIn PDF document text
    • http://vegunag.rf.gd/bamakixa.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/zedolizofojekafigap.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/imo_auto_call_recorder_app.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/mifijujitisu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/mibugunupowirifepaxofivej.pdfIn PDF document text
    • http://degejukifukux.epizy.com/informatii_despre_caderea_zidului_berlinului.pdfIn PDF document text
    • http://pozonijegexovu.epizy.com/larsen_and_toubro_annual_report_2014-_15.pdfIn PDF document text
    • http://kevowuju.rf.gd/news_intro_after_effects_templates.pdfIn PDF document text
    • http://zisunajupanege.rf.gd/80321432043.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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 4804 bytes
SHA-256: 4c8423cb8701c2c652880308a3ffe7f564027f07443bab8c8531f5c5b602be69
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11044 bytes
SHA-256: a7adc78b5a953218d973e973234c947b51ce83906cd71a417e960ae945e31e85
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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