Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c632ce2e415644…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 00:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1df90c27856884345d6baa5e29943a30 SHA-1: 56fddd20e1bfa733706da728fbe9dcd10e918ced SHA-256: a4c632ce2e415644a8bbd7973349dc8c244b9fd34cf62ca9fecdef4ff4bb79f5
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though currently classified as benign, suggests a potential for phishing or redirection to malicious content. The file's structure and heuristic firings point towards exploitation techniques commonly used to deliver secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/HbdJGeoIq_s/square?utm_term=causes+of+arousal+in+sport
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecad5c8c19ad4998df088e/1626123612591/greater_curvature_of_stomach_function.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb377d59ba7421a41a396/1626125175739/beven.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8419fd602fc26e46ca274/1625833887228/delivery_certificate_form.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecb2bafb12492bbb5817b6/1626124986736/46020200128.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_off0000e2ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
font_01_sfnt_off0000fac3.bin
8ace635777d6cc62757969abad7fc26f90edd184ce54295337d131ae4893bc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10480 bytes
font_02_sfnt_off000112af.bin
b5ebc7e00007e875837e6879d7416bdf75387a0ddaa9c608e73896c4b8827c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16864 bytes

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