Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b92c64412b34c0e…

MALICIOUS

PDF

83.0 KB Created: 2021-07-15 13:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 832656f8a802cda1d0d7c2cff9c82f4f SHA-1: 2be83dc3e653c7929182debee2d08e6af48a7b47 SHA-256: 7b92c64412b34c0ea746cf056f429687c240ab6127fbf5619e432053d31f02a5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded URLs that, while currently classified as benign, are likely part of a phishing or credential harvesting scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/W5vEtEh6t-A/square?utm_term=gate+syllabus+for+it+2021
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edaf4c37bfc37e3c24db71/1626189644340/five_capacitors_of_capacitance_10.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7bc46adf2c26882ff0bcd/1625799751183/how_to_find_answers_for_tests.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91a12f229ba2ea836c548/1625889298888/christmas_themed_quiz_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee30f21cf0e6777f2d8c45/1626222834833/dofizu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8f95e0c99b3eb2d3815e/1626115989784/34610682788.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_off0000e16e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 16792 bytes
font_01_sfnt_off0000f985.bin
4988b5bd8106fe8f8312fa3ec50a34cd905639b74a0ec5e4a504170074dcedb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 10792 bytes
font_02_sfnt_off000112a4.bin
3b50c7d1ebc8ced52d9b9edf2dd36c73c530f0ce0ba57baebecc6586cec50cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 17432 bytes

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