Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4c652e7a4fcaab…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 08:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b973a6e61db6b43702644a0f9b64bb SHA-1: e42693f97a1e0efd9568320d4bf76b231ed055dc SHA-256: 1b4c652e7a4fcaabe9d9aaaa52064510570d2a6cb29db5c1f6e35b0673ca25af
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to external resources. The obfuscated document body and the wkhtmltopdf authoring application further point towards a crafted malicious document, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/gPkW7oTCsL0/square?utm_term=foods+to+avoid+if+you+have+calcium+oxalate+kidney+stones
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee8832db6052518eca81e8/1626245170493/jaxemumi.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a2e72e2584f24624c2d/1626110510661/85248496894.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0b127311eab0d81a505d5/1626386727888/leave_travel_allowance_exemption.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1015dc825a553dff2fee3/1626407261742/2548985332.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7cda700aa07a78942b20/1626111195021/wow_instant_pvp_server.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edf207017ec663b53e8ad9/1626206727427/gabevotu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f25c00c4d0d61e672e15df/1626496000646/simple_past_not_go.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9490c0b9b61b5973fc2e/1626182800477/maslows_hierarchy_of_needs_activity.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f15df4db86a67d85849ad3/1626430964504/tututofunamifeberadesit.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7f6ac3fb560d26f27ba4/1626111851015/harry_potter_and_the_chamber_of_secrets_full_movie_hungama.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_off0000e895.bin
8b4bda6acaa352a613fe9cda8ea7598f9e74bb966484fca150aec80a268f9f09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16164 bytes
font_01_sfnt_off00011267.bin
9894714e923c1e222b6826decfa8acc3e6b689f19c4b1d96b7906857157f0d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 11092 bytes
font_02_sfnt_off00012c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 16792 bytes