Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53075268a95a1bb…

MALICIOUS

PDF

94.1 KB Created: 2021-07-14 08:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87aea885b152a33d1ff73782c015dcff SHA-1: be5dd07d9718e2f4808fedc39be12d883f1046a6 SHA-256: b53075268a95a1bbafc60a9762b6910ef4c5f5e58496617959e812fdceddaa05
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 high likelihood of malicious intent. The presence of embedded URLs, although some are marked as benign, suggests an attempt to redirect the user to a malicious resource. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5781

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/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=preparing+questionnaire+for+research
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede1dd3e0111437128ba09/1626202589534/probability_examples_in_real_life.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7d87ff4d7c53d8b131bc9/1625806975590/vinezodaperatibevose.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ec583ba7d954d543984a/1625877592974/use_of_computer.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e94ed00a287971af9b5630/1625902800157/33177067186.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_off00011070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
font_01_sfnt_off00012887.bin
5b687102ab9cb0b0ef3338cfaf8b458e9e72a236ff0dc57a409cda01659042c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 10960 bytes
font_02_sfnt_off00014196.bin
e63681586f7c9b024d147c01cfec1d497758e7def2d8d744910a1e3abf285ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 16608 bytes

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