Malicious PDF — malware analysis report

Static analysis result for SHA-256 71770b7480de7e1c…

MALICIOUS

PDF

109.6 KB Created: 2021-07-14 00:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 709e23be284c1eab829beaedc5febfc7 SHA-1: b89f721ca7c2842ee669420757d6bc4d789aef59 SHA-256: 71770b7480de7e1c3121466f48a6aca2798abbd1c8c8563ad99dc611193f3a11
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 users to potentially harmful content. The PDF structure and embedded artifacts, combined with the heuristic firings, point towards a phishing or malware delivery scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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/~3/0YvHz_IItD0/square?utm_term=lesser+feasts+and+fasts
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee0361c450ee4730830e6e/1626211170012/82102518751.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec813ec217102653d60272/1626112318407/all_about_capricorn.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee02dad9d5ad70ebd69ff0/1626211034191/aha_cpr_aed.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79b058ad60325f0c2a053/1625791237815/75232381962.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d7b760c9e2bcf426f08/1626111355540/how_to_slime_without_glue.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_off00014e99.bin
0992395069bef0eec768f2b8ecec6ab903fd802274b448062bf9ef74b536b439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 17832 bytes
font_01_sfnt_off00017c5e.bin
47c15ce492989ad2cddf36dd818ef2e5df81f6504a51ecd2edb97a82ab77cb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5E 10044 bytes
font_02_sfnt_off000192d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192D6 16792 bytes

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