Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aa46bc39df489a…

MALICIOUS

PDF

77.8 KB Created: 2021-07-13 02:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15bf5a9a697a441cda97ccf628f83c0a SHA-1: e7f0cf78a74f5f295416fbbbbe5c74db80832c7f SHA-256: b9aa46bc39df489a04d5505820f468095b17bc046781a324e96c9a16dc1d3fb1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests it may be used for phishing or to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/kVSxLQpkboc/square?utm_term=if+your+viral+load+is+undetectable
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e891cb1627a515c055a55e/1625854411626/one_true_friend_is_enough_quotes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9391ce51f1f218d6acb28/1625897244904/domain_group_policy_editor_server_2016.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c259af17b116dc5da0e8/1625866841942/best_way_to_sell_clothes.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e961d8f4fe78435a3c7f7b/1625907672792/73564160728.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e80e4e8592fe3a5893a5e6/1625820750469/dr_jekyll_and_mr_hyde_english.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_off0000d074.bin
a433fa99e6875fdd837a99ae9fab3484b08a84e25b888f4425ce92b6293cc5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 10840 bytes
font_01_sfnt_off0000e9a1.bin
3cb45e8b9d48eb4772f4af604fefc5b93325dbd275ceba6c1e6c3c0dafde79f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16100 bytes
font_02_sfnt_off0001135e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16792 bytes

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