Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6086f855fe7878f…

MALICIOUS

PDF

78.7 KB Created: 2021-07-17 07:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d749bc194b424d02d80282ce77c218f SHA-1: f5bf35d0398971953ef1541abfa2afd80539b548 SHA-256: f6086f855fe7878fd0e38c4f358abef7c8605cd87cdb71e1fe9e6fb24c314e44
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojan threat. The presence of embedded URLs and a visual download button suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/u8n3KCQdUYc/square?utm_term=ntse+maths+questions+with+solutions
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1c8ce761092733f850285/1626458318229/velekiwamozufafixog.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9231ac22c005c9338b742/1625891610948/how_to_write_interval_notation_on_webassign.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f01c6190ddb31b72a933bc/1626348641834/42010009624.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8a77a3e9df788e6e0c6c/1626114679365/lord_of_the_flies_chapter_8_quiz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e2f3db8bb141bad61922/1625875187976/unlimited_power_tony_robbins_review.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7cc5380504e0a7768a958/1625803861367/bitatilipupik.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee1224fd66ff3739eb158f/1626214948764/bonaduvidusanigif.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e869c1347018579c8808c0/1625844161743/13011183213.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0802af347573036ab7ae7/1626374186170/welazelixegakexezesajod.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_off0000d3bd.bin
443e832c5cd98feb00e86e489475a52cdcf34e64e9ee63e993766897b0c96bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 16512 bytes
font_01_sfnt_off0000fea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16792 bytes
font_02_sfnt_off000116c0.bin
76e1734c038bea70a9974e99fff468825bb5431d0dab4d3a7f4577cca190cc23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10584 bytes

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