Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa4cd12cc2ee752…

MALICIOUS

PDF

117.3 KB Created: 2021-07-12 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eabd9ec49a9e2d349b20796031e5435 SHA-1: 43ea825c2b8de662205d0f78b6281fef3cdb115c SHA-256: 5aa4cd12cc2ee7520bca068450b601cef474bd0a56ebb59065430e5f2942d740
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV detection and the presence of an embedded URL strongly suggest malicious intent, likely for phishing or malware delivery. Although the document body is heavily obfuscated and unreadable, the heuristic firings indicate the PDF contains external URIs. No scripts were extracted from this sample, limiting further analysis of its execution flow.

Machine Learning

  • Nyx PDF Classifier clean score 0.1264

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=bad+red+hair
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93c758ce0e10532d37f15/1625898101329/performance_appraisal_questions_and_answers_sample.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7c311f29cd6423db34b7b/1625801489778/rum_vermouth_cocktail.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_off00016ce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE6 16792 bytes
font_01_sfnt_off000184fc.bin
6d9c48bd3f1b88cf03812b13f7bb9b5909a1a11e5cb4fdc6ec77d0834afe359e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184FC 9860 bytes
font_02_sfnt_off00019ab7.bin
d2d46bab47baf0dd5bb77beb020ab79437699ad7fba35661d3fa2c7d184c2600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB7 18140 bytes

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