Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5c371290190e2f…

MALICIOUS

PDF

76.3 KB Created: 2021-07-18 09:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81719d00b81017dd68e8d94b711b1e00 SHA-1: dcfd23ccff3cfe6ead8c01f71801edd8e3c9bd52 SHA-256: de5c371290190e2f65481ce0de58cee9e5f59902f555541f208b304a81f74097
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, suggesting a potential phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the nature of the detection and the presence of external URIs indicate malicious intent, likely related to social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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/sq/ugae/~3/WVKuihPcy9U/square?utm_term=old+concept+of+physical+education
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8a4f0d838b6c850da012/1626114639378/how_to_make_orange_buttercream_frosting.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f288bb22602c08cae7d3c7/1626507451588/jimawigadaweja.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f28264deec5816202668fb/1626505828929/mendeleev_organized_elements_in_his_periodic_table_in_order_of_increasing.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f27295ec5ad00cc08708f4/1626501781478/triple_occupancy_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e81dfe97884458c9a45c66/1625824767018/pazifavosedenururoke.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_off0000ca30.bin
a1f2130ecf6f2ec55dbd8a85a6e4751cbc3bbe21881dc3aafc4a3926f9de708d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 16152 bytes
font_01_sfnt_off0000f416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
font_02_sfnt_off00010c2d.bin
2c82d57b0abab06a5714e11c909d57dd823ca2ada7f7f5549fee44b435527132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10856 bytes

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