Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf5fc504fd218cc…

MALICIOUS

PDF

80.0 KB Created: 2021-07-15 19:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c17ce262d675cee3fe4dd8573be6ebf8 SHA-1: 48f066ecbf78b22f3a9992c0336172c771a4c263 SHA-256: 1cf5fc504fd218cc6f1cc245dd0422f5aee17c15b16effc7fd13fb848885c5f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded external URI pointing to 'https://krisoc.ru/square?utm_term=coherence+in+a+sentence', which is likely the malicious destination. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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://krisoc.ru/square?utm_term=coherence+in+a+sentence
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ece2a6cdb2ce13c51f5808/1626137254105/mexedadobalu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee6d15aa539923b5896dbe/1626238229536/only_one_jesus.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0569db4c8e87452cde4fc/1626363549432/wetevakivupugexifoduv.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_off0000da5c.bin
8f27136f257225070c9ed97a06813961cebd25b0e05cc02b5789715eb47ab5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16556 bytes
font_01_sfnt_off0001054a.bin
d6200a51fc6d55e3ad7f720b349653461ddb7126a169d848d323941df01ec540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 10312 bytes
font_02_sfnt_off00011c8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes

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