Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9b568a241c4bb5…

MALICIOUS

PDF

74.5 KB Created: 2021-07-14 09:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e18b72a7205c4ab59115fded24d9c8 SHA-1: a617909f017afe128d6b01c1cd8376f45446d0b8 SHA-256: 8c9b568a241c4bb55de9793f697fe7db8f98656b588137a7ba33c2d30ebc529f
96 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. The presence of embedded URLs suggests it is designed to lure the user to external resources, potentially for phishing or to download a secondary payload. No scripts were extracted, but the overall behavior points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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/ZV5PD9BTPXI/square?utm_term=the+day+you+begin
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee7fb9b27e5958d592eea2/1626243001363/nekudefexejavidedibo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede6a04ff81d3e28152a2c/1626203809027/period_of_trig_functions.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca78811a746407a44beca/1626122120229/zafili.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e90cbef107ff2467e82c6d/1625885886495/four_paragraph_essay_example.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e81e13a3609a707baed160/1625824787158/vezalotomin.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e826ba45e16b3be7ecd8e5/1625827002890/royal_chace_hotel_redevelopment.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_off0000c478.bin
c49297cc1ebac8bb2be775fd631ce03c9b1529823a7a0dabc8189d931ef456ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 10432 bytes
font_01_sfnt_off0000dbcf.bin
598aea48abeb7a171057d9a7a921e50e2eac0abadd21b78b5bd0ea00807fe767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 16416 bytes
font_02_sfnt_off000106a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes

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