Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8f5d03de8eb7e8…

MALICIOUS

PDF

80.4 KB Created: 2021-07-21 13:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75257f56b8d3e99acebcf7cafd520fb9 SHA-1: 70dd11a345b00ea2a6546b14017c602cbfb43258 SHA-256: 0f8f5d03de8eb7e88ad31ac630dd82cbdc361939fed933f653690747a8e3140c
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 malware distribution attempt. The embedded URI points to a link that, while currently classified as benign, is likely part of a lure to trick users into downloading malicious content. The document's structure and metadata suggest it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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://feedproxy.google.com/~r/razvivatel/yapz/~3/gPkW7oTCsL0/square?utm_term=irrotational+flow+definition
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f622211138321192aaa83b/1626743329223/human_resource_development_werner_7th_edition_free_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7a91e9bae382bbabcbf54/1625794846488/6_ft_4_in_to_cm.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f092651d36d94a2ac5f765/1626378853746/baudelaire_series_of_unfortunate_events.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee0728afeffb59e6764221/1626212136325/multiplication_without_regrouping_worksheets.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_off0000db1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16792 bytes
font_01_sfnt_off0000f336.bin
b9515a9c7fe8a4c25f77e60d1e49b4ad612d17d86377c58b6a5378274a01e68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10216 bytes
font_02_sfnt_off00010a41.bin
33388abfda5b57e084fcb09205f7e1d2230f8126cfd67ed460598fb9f497039f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16700 bytes

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