Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d42589e06c8b28…

MALICIOUS

PDF

129.3 KB Created: 2021-07-14 00:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d27ae07908a80afa3bf2cc12b25772c9 SHA-1: 93e78a8a4552456e3d8ca7c6304de80cdebe5bfc SHA-256: 72d42589e06c8b28390674d43a1c1649c10659282220ade938c5576e725ae93c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that, when clicked, redirects to a page that appears to offer a Chrome OS download. This is a common social engineering tactic to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF_URI heuristic confirms the presence of an external link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7356

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/~3/4Ji06Fp1PxY/square?utm_term=chrome+os+download+for+pc
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0083d6ef6771c1df9534/1626210436119/77763951905.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9ed44f2b1c51afa6502a/1626119892752/bs_special_education.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca1198c19ad4998ddd3f0/1626120473656/30200980861.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91c26c91b61347ea37df1/1625889830997/science_fiction_double_feature_tab.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7919c8b0d544b6d69218/1626110233195/pure_object_oriented_programming_language_list.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_off00018b1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B1D 16792 bytes
font_01_sfnt_off0001a32f.bin
4c433b32c97dd7aa98874a660b4e823e1b468eba7537f8798a3dfc24a8471593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A32F 28728 bytes
font_02_sfnt_off0001df03.bin
933f5571eab7969b84c46987dad05f03a9286263854d50dd5c1a04298d2dffd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF03 10812 bytes

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