Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7ed49a56e24911…

MALICIOUS

PDF

77.1 KB Created: 2021-07-19 18:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1309b0275119a017d2c12901c80d5fb7 SHA-1: 41e216ddffd13766285902a09a1a7bab3216947b SHA-256: cb7ed49a56e24911cee33e81ffbb9c0d08b5c8386be2a04f3396268a394a9d4c
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those initially marked as benign, suggests a potential phishing or credential harvesting attempt. The file's structure also shows signs of manipulation, such as duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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/AG-UZpNbJGc/square?utm_term=c+section+pain+after+6+weeks
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f17eaa347a2e2c84033758/1626439338286/clash_of_clans_december_2020_update.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec84e5fd54eb07082609a4/1626113253794/69720759496.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca74790a3fc49531ca86e/1626122056045/fesukukutot.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e923945ebba154a8fc55cd/1625891732605/objections_to_descartes_meditations.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f06f7fd8d49b3972719d17/1626369920609/preposition_worksheets_for_grade_2_with_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8626dcef4a49b3ab1f9a/1626113574171/how_to_open_apk_file_in_pc_without_any_software.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_off0000cdc3.bin
b6336a08bb6c16ae70765842fe0630a6d3e09d9e09d35670e731d3e2130916f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10804 bytes
font_01_sfnt_off0000e6e8.bin
40f309bf5f9605248e798dd5e20c5539e69fb674d0d2f88db0fe5f2a4bf31fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 16076 bytes
font_02_sfnt_off00011082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 16792 bytes

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