Malicious PDF — malware analysis report

Static analysis result for SHA-256 e052d8073d3d7f31…

MALICIOUS

PDF

79.1 KB Created: 2021-07-14 06:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fdbe1a43ac156aeabd2bad8f78d8515 SHA-1: 72d0ae99cc7933afeb66028817429f02e434d1be SHA-256: e052d8073d3d7f31796d22ede1607dfba15a87c7d079c6a934135af63f98a968
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which points to a suspicious Google feedproxy domain. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8584

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://feedproxy.google.com/~r/sq/ugae/~3/X6hrLWyzjlw/square?utm_term=square+root+of+18+simplified+radical+form
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec706c5978cb5ccaa8eb62/1626108012632/75918099263.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edaee8c7772f26c8529c93/1626189545178/jubegisekafivat.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8d8e7dc7460dd09b785e/1626115470700/87515667265.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8ed60f7d8d50062c97d1/1626115798754/core_java_collections_interview_questions.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecac8997282d6f46943739/1626123401499/37_relapse_warning_signs.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edb57a834e745de9d2f6a2/1626191226929/41398322388.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e860a5ac51e4673b19db6e/1625841829152/wizur.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cede.bin
c4b14cb7077c5e07cce4729d9fab519efada2233e2d25096426325e2329bb383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 17776 bytes
font_01_sfnt_off0000fded.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16792 bytes
font_02_sfnt_off00011604.bin
31aa679e28b2100dc8ec16a95d41ded33c604681357e915736e480bbaf5699af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 11260 bytes

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