Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eb41901ea87b2b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca976555620f08ade13b1c036f75f1b6 SHA-1: 6052a8ddc261091a5701188eb939afc83f30324a SHA-256: 67eb41901ea87b2bb930660269f64d3a9a51830343b3764be65f554804564bc6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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/uzX87CUNjRg/square?utm_term=use+of+grep+command+in+linux
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e923aa83ae0c4902392c5a/1625891754332/expired_drivers_license.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0a27a3a4a34189bd01ee9/1626382971239/66145441512.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c8b04c181567023cab22/1625868464577/pazeki.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7bc6e1d61f435cef63f5f/1625799790122/perusing_the_internet.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0a3cb6c6fe12ee0044100/1626383307542/strawberry_limeade_smoothie.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_off0000e413.bin
2240682d2356ca5dce40f2f15190cec4d70105f4e0845392f916cf9f95d6c147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 11072 bytes
font_01_sfnt_off0000fdb0.bin
e487673f6fcb5c47b5fc046f7939ab246d0fd529923e24b57134aab4423c208c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 18040 bytes
font_02_sfnt_off00012d85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 16792 bytes

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