Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5a38a1ead46165…

MALICIOUS

PDF

84.9 KB Created: 2021-07-15 20:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f082efee94d6e46cdbc457f92a4affa4 SHA-1: 4300a72c974af50ce8ab5fb5a8dba853818a4713 SHA-256: 7e5a38a1ead46165bd9b561fb3067f05f8db7d25a709d1759a0297eabe0e9465
96 Risk Score

Malware Insights

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

The file 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 a potential delivery mechanism for further malicious content. The PDF structure itself may contain an exploit, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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/NsX9ihectO0/square?utm_term=mathematics+for+computer+science+book+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efe03fd9659e278644c111/1626333247950/78522818210.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c3454be6b65fb4b0ec04/1625867077780/eml_to_pst_free.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec994251a87c5d75ade380/1626118466328/bajejerem.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95bd1e6bd1231e609a0f2/1625906129903/worlds_largest_polluters.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e87bb074000c7cf29f291e/1625848752258/lorabupibugoximujobi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edefcc82b49873592bdbb0/1626206156937/82202198915.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e959ed3f195e1e4038071d/1625905645402/perfect_liker_download.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_off0000e8f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16792 bytes
font_01_sfnt_off0001010f.bin
e5cc1fb62135a78ea6051506748a62b5154376526f16a50c2f9b27e49cde7f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 11164 bytes
font_02_sfnt_off00011abb.bin
1aa531b86f61d500dabff15bddb255efd6b9cab32d6a10d17f90f2305347eaa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 17172 bytes

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