Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d11369815e8f78…

MALICIOUS

PDF

73.0 KB Created: 2021-07-13 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ffcb75240cff66f3f23c2a2921bb547 SHA-1: c1e4f7e9dea40fac3e06f801713b7d09a4c5b30e SHA-256: 77d11369815e8f7862d0db45548119938eef17ab8cf79d21d64f3c2ab9dc6c5d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that, while some are marked as benign, suggest an attempt to redirect the user to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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/-MXWpcYQ7kA/square?utm_term=word+to+small+pdf+converter
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edaab57d02012a36334424/1626188469889/gallons_are_in_a_quart.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec870be64ce53716352b35/1626113803680/sovukogage.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb406262c1d401136d55c/1626190854505/seven_rivers_in_africa.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb651522a830616591306/1626125905308/sword_art_online_psp_english_patch_free_download.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8d0cec158db2a32da8faa/1625870542561/agile_requirements_traceability.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93f1b309bd63f3d86ffe5/1625898779255/baltimore_radio_stations_online.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_off0000be4c.bin
77044b3dc3684b0dfab62e567e3a4a40602ed3e3806d9984c9f14bcd32285d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 15864 bytes
font_01_sfnt_off0000e73c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
font_02_sfnt_off0000ff53.bin
0db51957c26fe5a7b2378d11ba36dbf6f35597afa141c3cd76c9a30e46df1e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10748 bytes

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