Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aec7aa25e7598fb…

MALICIOUS

PDF

79.9 KB Created: 2021-07-14 04:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9fabe4aea6c0df9bd56d8524015369f SHA-1: a2ddf8f3cc7fe673e33023b5d6a2178747d20ad1 SHA-256: 5aec7aa25e7598fb6b08fcc692f4dc46fff50598604e4afb8491e5336ab7bd10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to lure the user to external resources. No scripts were extracted, but the file's structure and heuristic firings point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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/um1bUVUAM38/square?utm_term=how+to+pronounce+about
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94ea837cb904475615540/1625902761074/one_more_day_wood_brothers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee27b3b82b3047685ec505/1626220467365/50134529809.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e924862210ba6bce1247c7/1625891974627/minecraft_download_pe_android.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee3306e03b615e098d7ffe/1626223366799/react_native_for_mobile_development.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f7938592fe3a5892c278/1625814931972/residue_at_infinity_example.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee15f31f51426150ca2378/1626215923221/search_words_in_image.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee04383e011143712c3ea7/1626211384228/wugipuwopamota.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_off0000d4ab.bin
c039b7405bc9d1e2e7764d5fa85f3fed67b1831f12616553425db05580ac68cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 18780 bytes
font_01_sfnt_off00010438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
font_02_sfnt_off00011c4f.bin
9d64d5b1ee64e03071b640bbbd3f652616b7a021f4627b7cc06bd03348dba88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10380 bytes

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