Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b009ff5d5668b1…

MALICIOUS

PDF

76.2 KB Created: 2021-07-12 23:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c47767b1cff55b56ec305b5791e3f702 SHA-1: 09eda505862115801d0ae26bf5bd15932b6e46ca SHA-256: a3b009ff5d5668b1b9e7f09cc5a4c9c7d154adc768bbda7527a235e505d62ba7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources, potentially for phishing or malware delivery. No scripts were extracted, but the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9236

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/W5vEtEh6t-A/square?utm_term=falling+in+and+out+of+sleep
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e77bab397fa11ba24b2492/1625783211855/max_th12_troops.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8781fa40056e74d2ad2b/1626113921493/ripping_small_pieces_on_table_saw.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e633631fd4ab816ec06/1626115683667/impact_of_unemployment_on_economic_growth.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92639854c1d3b3487241c/1625892409474/wobodurasepi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a6c725441e1b37831335/1625794247666/the_millionaire_real_estate_agent_gary_keller_free.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7b72c86d8930991a47b4e/1625798444706/bufojitadesejozi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9359f6fc466b5bf483a0/1626116953758/can_you_pull_a_tendon.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_off0000c781.bin
3b528d34a013442faf14acac2d0ecdaa53a8e2cf35c437b18d0f792dc55fa235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 17364 bytes
font_01_sfnt_off0000f492.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
font_02_sfnt_off00010ca9.bin
d3de781497e4ef93356de69bd559e9c34b77ec55443f9755a41120903d26c81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10652 bytes

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