Malicious PDF — malware analysis report

Static analysis result for SHA-256 916afd5440577070…

MALICIOUS

PDF

73.6 KB Created: 2021-07-21 09:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4234ae2c26a5440149884171ddf6c7ce SHA-1: b5ec131227287936c67079955dd8068d6645e779 SHA-256: 916afd54405770705deb0883fcae41edc9e38f0ffa978fa14bea9248f5870d04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. An external URI pointing to 'krisoc.ru' was extracted, suggesting a phishing attempt to redirect the user to a malicious site. No scripts were extracted, but the presence of embedded URLs and the overall detection indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7629

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=tax+and+spend
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ede2dfe7c05a53525754e6/1626202848007/rugadadisesuweletuman.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec83de4c0b954f9ea42059/1626112990337/xirosezebezilaj.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f6db4ba26af20f95b882a7/1626790731764/geographical_presence_meaning.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f483f3ec5ad00cc09c9e51/1626637299385/accoutrements_in_a_sentence.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_off0000c217.bin
2931cea76f1d901c3988b21776e62c19e3f643f8fc99f3252d95dc8b688f172d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 9996 bytes
font_01_sfnt_off0000d859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16792 bytes
font_02_sfnt_off0000f06b.bin
f16c3c445a7f4b5742e6a90ad362d63c4458a026fc2e436c324b4850c8517717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 16724 bytes

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