Malicious PDF — malware analysis report

Static analysis result for SHA-256 885ef3f8d2471798…

MALICIOUS

PDF

78.7 KB Created: 2021-07-13 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56de65f308b24dd6752ed099616e15cc SHA-1: 56e3260b7d5d97a59fd8677c044f5d7b07dfba11 SHA-256: 885ef3f8d24717983748bbeb55c023fcd308f9126426f903ca3c6bff92f3cc42
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the PDF structure itself is suspicious due to duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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/AnJPYMJXbyQ/square?utm_term=the+sound+of+music+class+9+mcq+with+answers
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca1198c19ad4998ddd3f0/1626120473656/30200980861.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed0126f67381323ef27c97/1626145062668/river_gorge_windsurfing.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e88da4c35fbf1ba6cc3630/1625853348906/jeridiragufonaxejasal.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80e915eabb22f35dcadf8/1625820817756/what_is_the_normal_room_temperature_in_celsius.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8fbe212fb7d0b2791cde1/1625881570486/card_game_called_may_i_rules.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8fe2a5ebba154a8fab047/1625882154871/mudegowenuzukanade.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_off0000d18d.bin
586412fa1feb357c69e4529a1ff5403efce3055a0db61575fbd3aba2f2d626fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 16536 bytes
font_01_sfnt_off0000fc82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 16792 bytes
font_02_sfnt_off00011499.bin
3881c50272cc458953e33e854030e6d7e098d31868d9077c54225e02fbf243f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 11204 bytes

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