Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0ac79907da0bbd…

MALICIOUS

PDF

78.4 KB Created: 2021-07-15 19:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e895e44fc1971a8ca38165d955b001ba SHA-1: d4480a54cac9af729edb3ae9c8e37c2da4f5ca16 SHA-256: dc0ac79907da0bbd963a1e8853872eb77e466566d113a32a87e830baf4dd6c33
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 high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to external resources. The wkhtmltopdf authoring application and PDF structure are consistent with documents used for phishing or malware delivery. No scripts were extracted, but the overall context points to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/UZrB20b2Dcg/square?utm_term=how+to+merge+two+excel+sheets+based+on+one+column
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e85ddbcfe981087482e5e5/1625841115243/asl_sign_for_no_one.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d3a9c158db2a32dac00b/1625871273764/free_fabric_giveaways_2020.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e924862210ba6bce1247c7/1625891974627/minecraft_download_pe_android.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_off0000d1aa.bin
c60234c267b3297221bf0cb6d8c087edcae726b6a8f9941e785d171107af81dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16404 bytes
font_01_sfnt_off0000fc0f.bin
5435883fdb20f768544055eaeb08d362866408f86d0d9e643705ea2a25485868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 11144 bytes
font_02_sfnt_off000115c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16792 bytes

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