Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893e9f194234df4…

MALICIOUS

PDF

76.0 KB Created: 2021-07-13 18:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 129cf7ff59599530c63ae7c1f11cd9d6 SHA-1: 21789ceeafc1606bed1e6633c4ef24888d3fb6e7 SHA-256: 0893e9f194234df46a71a538094dfd58374039ae2c26e6ce67a25de74213abd0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URL. Static analysis heuristics and a machine learning classifier flagged this PDF as malicious, with ClamAV detecting it as a phishing trojan. The embedded URL, while labeled as confirmed benign, is suspicious in context and could be part of a phishing attempt to redirect users to a malicious site. No scripts were extracted, limiting the analysis of the attack's execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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/uzX87CUNjRg/square?utm_term=forty+two+pte+ltd
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7ebe8300fd66e195ca64/1626111678074/an_alloy_of_zinc_and_copper_is_called.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e17f918372873878af8/1626115607932/subtraction_of_binary_numbers_using_2s_complement.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecfe08f9a98d6db3a839a2/1626144264951/jabotafezuxefo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed18eae255175820bd4025/1626151146922/cost_of_gelding_a_horse.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c23b3be7a25fda2c50fe/1625866811856/powerpoint_for.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_off0000cc3a.bin
b1200280af47b9a2a1974c4a0db1c513801d2569e1e9cd6c4273276c4e01120c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16100 bytes
font_01_sfnt_off0000f5cf.bin
f87a15d754488f29e8c0bbab647e8f53a1db249df821c2dae0ac5e82a6aa865a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10036 bytes
font_02_sfnt_off00010c46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes

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