Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d231bfe583d8de0…

MALICIOUS

PDF

77.4 KB Created: 2021-07-20 05:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30940cc9cf0ba1db157b8cb41e8ca190 SHA-1: bfed50c162fabcd8a4c5a555ed520cb08ecb07cf SHA-256: 8d231bfe583d8de01297bfcdc25ced41d9ecd98451a5080ad17b2b49fc46b222
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/sq/ugae/~3/hIkXU_AiHkM/square?utm_term=looking+up+to+you
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f5f1c867ad356d478fb343/1626730952945/picture_to_word_document.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edde172799685454f90560/1626201623878/figamuwakesekodizarejevig.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f5ffa0a82d6e2801c5e0f4/1626734496907/laniba.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_off0000cd1e.bin
8812aa4d4243507091304f66913e409c769bbe1d0fe8bb20cfb021203b93e436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 17588 bytes
font_01_sfnt_off0000fb66.bin
2db3de9ce12678c2825ca071a8c671e5df40130ff8f8c15cb89d331681524407		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10084 bytes
font_02_sfnt_off000111fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes

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