Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a831e6e5fc16f4…

MALICIOUS

PDF

76.7 KB Created: 2021-07-15 10:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7318c88a2954e53103e3d699ccfb77b5 SHA-1: 558a9ddf35c3f96fc4972b703ec7dd9ce2ed6ac2 SHA-256: a1a831e6e5fc16f48706fce20f0d332b4a43f46c31e28f218439fab20c7baecb
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 high likelihood of malicious intent. The PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/mHcMeCcfVl0/square?utm_term=japan+climate+now
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efc95624fa75375d829e71/1626327382226/sesinajus.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee7d5f6bb0602df215174b/1626242399842/51077178666.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede48f1f6a95122870670d/1626203279934/sovuwazodi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ec43025aa46e30d03710/1625877572006/home_made_coleslaw.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7727c268f363b085828f/1626109735282/download_battle_of_warship_mod_unlocked_all_ship.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_off0000caa5.bin
5a7ad6e52d450d3208e3176a0fde897b4df5ae6a3cb6118e618cd55d29e131c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 16660 bytes
font_01_sfnt_off0000f625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes
font_02_sfnt_off00010e3c.bin
caa2c444d2e7a58994bd35339919de1f65d702ca81b1dafca49c05796531557d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 10344 bytes

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