Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed739923a989478…

MALICIOUS

PDF

77.3 KB Created: 2021-07-13 04:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c4552d0147a537052d4bf8735fc163b SHA-1: d68fad89d9bbc38d6f0559686bb85967ead67c5e SHA-256: aed739923a9894787594a29952a8e0ad2f571bcd932dc9f2f84b762669972b0b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Static analysis identified an embedded URI pointing to a suspicious domain, 'queure.ru'. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of a malicious URL strongly suggests a phishing attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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://queure.ru/square?utm_term=whens+the+next+basketball+game
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecdbf1b1b13d3c3c09afba/1626135537487/80869069483.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec83abef188817f7e168fa/1626112939495/sweet_noodle_pudding.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76bed653c7c4997d6e21b/1625779182063/propranolol_every_day.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8d53138670b5817c4aa26/1625871665425/hiit_training_at_home.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_off0000ceac.bin
84667de392221e3ed8e93db1f5f240d40636b51e1e6a11874e79f98e44e1addf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16376 bytes
font_01_sfnt_off0000f943.bin
ae785af950e75958f3e2c133cc79d6fafa8e9afe6344ac6eb06b29f1ceb064a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10568 bytes
font_02_sfnt_off00011143.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes

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