Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae07635350fcc13…

MALICIOUS

PDF

82.7 KB Created: 2021-07-16 12:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfdb29debc07f3ab77b5f1aabeb16e83 SHA-1: c5f1740fbe97a3077dd45492f907592cf9ca9833 SHA-256: bae07635350fcc13e50c9f79e5efb5da0c359a403d94db65f61d9342fb037840
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. It contains an embedded URL pointing to 'huntic.ru', which is likely used to redirect the user to a malicious site. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/square?utm_term=carrying+the+fire+michael+collins+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb822b2cb0e52868c8e4e/1626191906247/sugat.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c27f1102953de58265ef/1625866879499/zirokixerovesitu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9f6fc32416487af20ace/1626120048128/genegewuzedadigomuditivi.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_off0000de36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 16792 bytes
font_01_sfnt_off0000f648.bin
219c38a5773c1d60ed7f3155795623715bc2d632b8c4ebd80cbb41949e3bd35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 17380 bytes
font_02_sfnt_off000123a2.bin
ebda2a43fa6a0eed9ad19dbeec549f9a59e7f9e12e147d5d33e3ada0fff2c00b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 11212 bytes

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